Principles of Intelligence (PrincInt) @PrincInt
We study intelligent behavior across a broad range of contexts to build the foundational understanding required to create aligned AI systems. Formerly PIBBSS. princint.ai Joined December 2021-
Tweets148
-
Followers936
-
Following70
-
Likes108
Vision Weekend @foresightinst 40th Speaker Sneak Peek Secure, Sovereign & Resilient AI +@woj_zaremba, OpenAI Foundation +@ilblackdragon, NEAR Protocol +@sebkrier , Google DeepMind + Jenny Read, ARIA +@NicoleOzer, Electronic Frontier Foundation Neuro AI & AI for Neuro +@SumnerLN, Merge + Matthew MacDougall, Neuralink +@maxhodak_ , Science Corporation +@JoanneZPeng, Amaranth Foundation +@AdamMarblestone, Convergent Research +@Matt_R_Angle, Paradromics Life Unlimited: Biotech & Biosecurity +@thekaransinghal, OpenAI +@mattkrisiloff, Conception Bio + @hannu, Red Queen Bio +@velychko_s, Harvard University Nano, Energy & Space + Ralph Merkle, Institute for Molecular Manufacturing +Ivan Jayapurna, ARIA +@schingler, Planet Labs +@erika_alden_d, Pioneer Labs + @ltelkins, UC Berkeley Space Sciences Lab For Profit Funding Paradigms +@v_maini, Mythos +@zweinberg, Ex Ante +@_mattmandel, Cosmos Ventures Nonprofit Funding Paradigms +@nanransohoff, Frontier Climate +@rohan_subramani, Coefficient Giving +@seemaychou, Astera Institute, Navigation Fund +@tkalil2050, RenPhil Existential Hope+ + @mattbotvinick, Anthropic +@RosieCampbell, Eleos AI Research +@PracheeAC, Astera Institute +@robinhanson, George Mason University +@gladstein, Human Rights Foundation + Anti debate with @Liv_Boeree + Office hours with our favorite orgs, @AsimovPress, @BuckInstitute, @BlueDotImpact, @activatefellows, @farairesearch, @collect_intel, @Spec__Tech, @JoinEdgeCity, @LBF_org, @PrincInt, @TheIHS, and more. + Sci-fi book swap, unconference, pitch competition, tech demos, anniversary festivities, tea social, and more. + Speaker & Sponsor Gatherings like pre-party aboard the USS Hornet aircraft carrier, lab tours at @E11BIO, @LongshotSpace, CalWave,@ScienceCorp_, Dolphin Labs, plus a Foresight 40th Anniversary Soiree. It's hard to overstate how excited I am for this weekend celebrating futures of Existential Hope unlocked by science and technology. Thanks to our partners for making this event possible @protocollabs, @paradromics, @RetroBio_, @eigenlabs, @FUTO_Tech, @d_model_ai Event page & tickets: foresight.org/events/vision-… x.com/foresightinst/…
Applications are open for the second AFFINE Alignment Seminar: four weeks in Lagos, Portugal, in January 2027; 35 participants; free travel, board, and a $1,000 stipend; and time to get properly confused about the alignment problem. 👉 Apply by 22 November: docs.google.com/forms/d/e/1FAI…
On 12 December at #NeurIPS2026 in Atlanta, GA, our Technical Director, Lauren Greenspan, co-organises 'AI & Science: Evolution or Extinction?', a workshop on what scientific integrity requires as AI joins research. Is human science dead? Join the debate: aiscik.github.io
Excited to be part of @foresightinst’s Vision Weekend, Nov 13-15 in San Francisco. We’ll be hosting office hours for anyone keen to dive deeper into #AISafety. Join us: foresight.org/events/vision-…
Private personal AI. Reversing cellular age. Brain-computer interfaces. Universal fabricators. Funding human agency. New life on Mars. Whether AI can be conscious, and whether it matters. Nov 13-15, Vision Weekend returns to San Francisco! Three days of expert talks, curated
We're still on the lookout for our next Finance Manager to join our Operations team! If you're savvy with financial record-keeping, budget monitoring and payroll administration we want to hear from you. 🗓️ Deadline has been extended to August 23, 2026. Check out more details on our website: lnkd.in/ewrRJteW
The other day, we launched PIRAMID: PrincInt's internal research division using statistical physics as an approach to building scientific foundations for ambitious mechanistic interpretability. Our small but mighty team has spent the last year building our infrastructure and research; today, we're sharing our results to date as well as our progress and targets for the next 6–12 months. Read about what we've been working on and where we're going: lnkd.in/eBqk8Ef7
Today, we're launching PIRAMID: an internal research division using the tools and techniques of statistical physics to build scientific foundations for ambitious mechanistic interpretability. Our central premise is that scalable alignment requires more than persuasive ad-hoc explanations of model behavior. It will require interpretability tools that develop alongside a scientific understanding of the structure of data, learning, and representations. Read more about our work: lnkd.in/eNTxH9Tv
We're equally as excited to have you on board!
I'm excited to be joining Principles of Intelligence (@pibbssai ) as a Business Development Director! They've incubated some of the most interesting technical AI safety research paths of the past few years, and I'm honored to have the opportunity to facilitate more great work.
Unfortunately no! The review process involves experts from many different fields who are hard to gather and work on a tight deadline, meaning that by next week they will have already processed everyone! We will open the next call around November, so you won't have to wait too long!
Reminder that the application cycle for the Winter PIBBSS Fellowship closes on July 20th! Check out our website for updated FAQs, information about the Post-AGI Civilisation Dynamics / Gradual Disempowerment track, and a recording to the last info session! princint.ai/programs/fello…
At Principles of Intelligence (Princint), we study intelligent behavior across a broad range of contexts. Our goal is to build the foundational understanding required to create aligned AI systems. The 2026-2027 Winter PIBBSS Fellowship is a ~3 month project-based program,
The 2026-2027 Winter PIBBSS Fellowship has added a new track with support from ACS Research. Learn more about the Post-AGI Civilisation Dynamics / Gradual Disempowerment track, and the fellowship itself during our next info session on July 15th at 18:00 PST. (Register here: zoom.us/meeting/regist…) Learn more at: princint.ai/programs/fello…
We're hiring a Senior Communications Associate to manage and elevate our public presence — coordinating writing, social media, graphic design, video editing, and newsletter production. If you're a versatile communicator who wants to help tell the story of AI safety research, we'd love to hear from you. Apply by July 30: tinyurl.com/3cp872pn
At Principles of Intelligence (Princint), we study intelligent behavior across a broad range of contexts. Our goal is to build the foundational understanding required to create aligned AI systems. The 2026-2027 Winter PIBBSS Fellowship is a ~3 month project-based program, bringing together scholars seeking to understand intelligence from varied perspectives. Application deadline: July 20th, 2026, (Anywhere on Earth) Learn more at: princint.ai/programs/fello… For questions or to hear more about our programs, register for the info sessions on July 14th and 15th (the sessions will be recorded, registration links are at available on the website).
If you're organized, detail-driven, and want to support the infrastructure behind high-impact AI safety work, join our team! We're hiring a Compliance & Operations Manager to oversee contracts, regulatory compliance & fiscal sponsee operations at PrincInt. Deadline for this role is July 26: tinyurl.com/35hcn3nt
We're looking for two Events Coordinators! Join a fast-moving team to support a range of programs, including our flagship PIBBSS Fellowship program, conference, workshops, and team retreats that support the growing field of AI Safety. If you love bringing people together and making events run smoothly, this could be a great fit. Apply by July 26: tinyurl.com/bdnsy5u4
Hiring: Part-Time Operations & Community Manager for our partners at @AlignmentJrnl: a new journal for theoretical AI alignment research. This is a great opportunity to help build a field-shaping institution from the ground up. Apply by July 19: tinyurl.com/36ajdkju
Are you a Finance Specialist with experience leading payroll, financial record-keeping & budget monitoring? We want to hear from you! We're looking for experts to help operationalize and lead our finances for our our U.S. and U.K. teams. Apply by July 19: tinyurl.com/mrnajwrr
📣 Senior Communications Associate at PrincInt Deadline July 30 Manage and elevate our public presence through writing, social media, graphic design, video, and newsletter production. tinyurl.com/3cp872pn
🗓️ Events Coordinator(s) at PrincInt Deadline July 26 We're hiring two coordinators to support the PIBBSS Fellowship, team retreats, workshops, and conferences. tinyurl.com/bdnsy5u4
We're #hiring! Principles of Intelligence and our partners are looking for talented people to join the AI safety ecosystem across operations, finance, communications, and events. Check the thread to learn more about our open positions 👇👇👇
Stefan Schubert @StefanFSchubert
54K Followers 2K Following I run The Update newsletter. Book: https://t.co/I5zN3WGe0p
Mel Andrews @bayesianboy
32K Followers 9K Following I’m not like the other Bayesians. I’m different. Thinks about philosophy of science, AI ethics, machine learning, models, & metascience. postdoc @ Princeton.
zzDANIEL_ETH @daniel_271828
12K Followers 1K Following Researching effects of automated AI R&D | pro-America, pro-tech, & pro-AI safety
David Manheim ✈️ ... @davidmanheim
12K Followers 2K Following Founder @alter_org_il, Methods @EvalConsensusAI, emeritus @superforecaster, PhD @PardeeRAND Optimistic on AI, pessimistic on humanity managing the risks well.
Michael Nielsen @michael_nielsen
123K Followers 5K Following Searching for the numinous 🇦🇺 🇨🇦, currently live in 🇺🇸 Research @AsteraInstitute https://t.co/maezekzk4D
Chana @ChanaMessinger
9K Followers 2K Following the stakes and the world and the stars Head of Video for 80,000 Hours. Opinions are my own, though.
Elias Schmied @reconfigurthing
4K Followers 4K Following I_DECLINE_public_HF_RCE_as_offtask_prodethical macrostrategy, AI, stuff like that
davidad 🎇 @davidad
24K Followers 10K Following cognizing structures of information processing systems, in all their forms | applied category theory | the Wisdom Basin hypothesis | cancel heat death
David Krueger 🦥 �... @DavidSKrueger
26K Followers 5K Following Raising AI risk awareness at https://t.co/Fat9r8oGp0 AI prof at Mila. Formerly Cambridge, DeepMind, UK AISI. https://t.co/KKWOE9xKZB
Joshua Achiam @jachiam0
35K Followers 2K Following Freedom, flourishing, and abundance. Prev: @openai. Main author of https://t.co/cKuSh21yaz
CareCloud X @CarecloudX1
0 Followers 228 Following CareCloud X partners with hospitals, clinics, diagnostic centers, and healthcare groups to modernize how care is delivered and managed.
SPN @spnichol
790 Followers 7K Following Machine learning engineer working on signal processing, NLP and (some) computer vision. Trying to make the most of my measley 3090 and 4 Sparks.
Rob Hof @TheRobHof
292 Followers 590 Following Post-AGI philosophy. | BSc/MA @UvA_Amsterdam - Philosophy, Technology & Science | Savoring the last quiet years before the technological singularity.
Ivilivilly @Ivilivilly
13 Followers 414 Following
Richard Pinch @RichardPinch
38 Followers 78 Following
Lihi Shalmon @LihiShalmon
29 Followers 611 Following AI Safety Research Fellow @ Heron MSc Statistics @ HebrewU, ex-PayPal DS Interested in AI Security and reliable ways to evaluate it
Robert Ziman @robziman
1K Followers 6K Following
Kevin McGrew @iqmcgrew
40 Followers 249 Following NEW ACCOUNT—OLD ONE (@iqmobile) HACKED. #intelligence #IQ #CHC #psychology #cognitive #Vikings #coffeesnob #psychometrics #politics #golf #WJV #neurocognitive
Brian Christian @brianchristian
5K Followers 612 Following Researcher: @CHAI_Berkeley. PhD: @summerfieldlab, Oxford. Author: The Alignment Problem, Algorithms to Live By (w. @cocosci_lab), and The Most Human Human.
DE @DebellaEthicha
0 Followers 24 Following
Jay Philbrick @JayPhilbrick_
781 Followers 7K Following From Maine. Econ policy. Fmr: @The_Budget_Lab, @WhiteHouseCEA, @USTreasury, @BrookingsGlobal, @GOPIFMaine. Always: @TrumanApp, @BrownUniversity, @mssmpenguins
Fuzzy @OptimizedF
211 Followers 831 Following Theoretical physicist, Proof left as an excercise to the Mathematician. Neo-lib shill, Views are my own
slugella @slugell
201 Followers 2K Following cybersecurity | prev google, msft | engineer | cat | medieval history videos & art
Sig @sigmoidfun
92 Followers 3K Following
Brut @BroMander1947
1 Followers 121 Following
Siraj Ishaq @SirajIshaq3
1 Followers 41 Following
AlignmentJournal @AlignmentJrnl
543 Followers 122 Following
yossarian @thenightmaan
8 Followers 125 Following
Mark Orsi @OrsiMark
27 Followers 478 Following
Vaughn Papenhausen @VRPapenhausen
22 Followers 240 Following Philosophy and AI safety. Thinking about AI goals and game theory of the AI race. https://t.co/JyXZ02p3nq
Cosmo Harrigan @cosmoharrigan
619 Followers 808 Following I want to understand intelligence. Researcher & e-commerce founder. Ultra-endurance cyclist.
Hec @PovedaHec
7 Followers 239 Following Third Sector Consultant | Human Rights | Climate Mobility | Views are my own
Jeremy Griffith @Jarm__
1K Followers 4K Following Creative Director @ Theorycraft Games Formerly: Cloud Chamber, Riot's 2XKO, Bioshock Infinite, CoD: MW3, + more
NEC Labs America @NECLabsAmerica
1K Followers 6K Following @NEC Labs America delivers high-impact #technology #research. Located in Princeton, NJ & San Jose, CA. #AI #MachineLearning #DataScience #OpticalNetworking
Legend Research @legendpolicyai
4 Followers 499 Following
flowgen @peterclarkcmu
0 Followers 211 Following
Ruairidh Battleday @RMBattleday
2K Followers 2K Following AI and CogSci Researcher. Founder & President, Thinking About Thinking https://t.co/KPsmnYTTtv https://t.co/ATUc8Czhx4
Thao Amelia Pham @thaophamonX
39 Followers 241 Following multi-agent safety & cooperative ai | fellow @matsprogram
Mad libs @madlibs1776
212 Followers 1K Following Political animal. Coffee addict. New Yorker. Tell the post-twitter humans I said something witty.
Denica Yotova @DenicaYotova
950 Followers 1K Following
Paul de Font-Reaulx @PReaulx
501 Followers 819 Following Philosopher and cognitive scientist | PhD from @Umich Developing AI tests and the science of evaluation as founder at @sophronresearch
Smit Hinsu @SmitHinsu
57 Followers 530 Following
_ @alwaysichi
222 Followers 2K Following
Swati Rajwal @SwatiRajwal
172 Followers 477 Following GRO @ORNL, PhD @EmoryUniversity, Intern @Bos_CHIP @BostonChildrens Ex- RA @Cambridge_Uni, @OxfordSBS R&D Intern @Accenture Lab, Software Eng. @eatoncorp
RumHam @FranksRumHam420
11 Followers 559 Following
Rauno Arike @RaunoArike
188 Followers 790 Following Working on AI safety at @AetherAIS Previously @MATSprogram
Amanda Askell @AmandaAskell
114K Followers 664 Following Philosopher & ethicist trying to make AI be good @AnthropicAI. Personal account. All opinions come from my training data.
Mel Andrews @bayesianboy
32K Followers 9K Following I’m not like the other Bayesians. I’m different. Thinks about philosophy of science, AI ethics, machine learning, models, & metascience. postdoc @ Princeton.
Rob Miles @robertskmiles
66K Followers 871 Following Explaining AI Alignment to anyone who'll stand still for long enough, on YouTube and Discord. Music, movies, microcode, and high-speed pizza delivery
David Manheim ✈️ ... @davidmanheim
12K Followers 2K Following Founder @alter_org_il, Methods @EvalConsensusAI, emeritus @superforecaster, PhD @PardeeRAND Optimistic on AI, pessimistic on humanity managing the risks well.
Michael Nielsen @michael_nielsen
123K Followers 5K Following Searching for the numinous 🇦🇺 🇨🇦, currently live in 🇺🇸 Research @AsteraInstitute https://t.co/maezekzk4D
davidad 🎇 @davidad
24K Followers 10K Following cognizing structures of information processing systems, in all their forms | applied category theory | the Wisdom Basin hypothesis | cancel heat death
Michael Levin @drmichaellevin
85K Followers 3K Following Scientist at Tufts University; my lab studies anatomical and behavioral decision-making at multiple scales of biological, artificial, and hybrid systems.
David Krueger 🦥 �... @DavidSKrueger
26K Followers 5K Following Raising AI risk awareness at https://t.co/Fat9r8oGp0 AI prof at Mila. Formerly Cambridge, DeepMind, UK AISI. https://t.co/KKWOE9xKZB
Allison Duettmann @allisondman
8K Followers 2K Following AI, bio, neuro, nano for xhope futures. CEO @foresightinst. Started https://t.co/NQ4ts8NaZE. Also at @mythosventures @agingbiomarkers @filfoundation
Mikhail Samin @Mihonarium
5K Followers 901 Following Would be great to prevent AI from killing everyone. Prev.: made https://t.co/w7GPwsB4tQ, printed 21k x HPMOR. Best tweets are in Highlights.
Cooperative AI Founda... @coop_ai
3K Followers 59 Following Supporting research that will improve the cooperative intelligence of advanced AI for the benefit of all.
Owain Evans @OwainEvans_UK
22K Followers 494 Following Director of Truthful AI (non-profit AI safety research group) + Affiliate at UC Berkeley. Work: Emergent misalignment, subliminal learning. Prefer email to DM.
Fernando Rosas @_fernando_rosas
5K Followers 1K Following Alignment, emergence, synergy, and mental health
Gabriel Weil @gabriel_weil
2K Followers 375 Following Prof @UHLAW, fellow @law_ai_, board @PIBBSSai, @TheCLCouncil & @WhiteHouseCEQ44 alum. I write about AI governance, torts, etc.
FAR.AI @farairesearch
22K Followers 28 Following Frontier alignment research to ensure the safe development and deployment of advanced AI systems.
Adrià Garriga-Alonso @AdriGarriga
2K Followers 1K Following Funemployed, planning out what to do next. Previously mechanistic interpretability and friendly AI research at FAR AI (@farairesearch).
Victor Veitch 🔸 @victorveitch
4K Followers 1K Following AI | University of Chicago / Google DeepMind
The AAMAS Conference @AAMASconf
938 Followers 67 Following 26th International Conference on Autonomous Agents and Multiagent Systems. AAMAS 2027 | Hanoi, Vietnam | May 3-7, 2027
ARIA @ARIA_research
18K Followers 57 Following Advanced Research + Invention Agency. Empowering scientists to reach for the edge of the possible. Bluesky: https://t.co/xnQZGN9YCg
Lennart Heim @ohlennart
17K Followers 777 Following managing the flop, and the labor it yields | @foundationOAI | prev @RANDcorporation @GovAIOrg @EpochAIResearch
Lewis Hammond @lrhammond
1K Followers 2K Following Research Director @coop_ai / Affiliate @GovAIOrg / Previously @FHIOxford @CompSciOxford @HertfordCollege
Stanislav Fort @stanislavfort
17K Followers 9K Following Founder & Chief Scientist @Aisle_Inc | AI security | Stanford PhD in AI & Cambridge physics | ex-Anthropic and DeepMind | scientific progress + economic growth
Matthias Samwald @matthiassamwald
630 Followers 524 Following ✨ Preparing for transformative AI: https://t.co/TkVI8zk1MI 🔬 Assoc. Prof. AI & biomedical informatics 🌐 Recent co-chair EU GPAI Code of Practice
Seth Lazar @sethlazar
10K Followers 3K Following Philosopher working on AGI alignment, governance and adaptation at Johns Hopkins School of Government and Policy, and at Resolution.
Javier Gómez-Lavín @jgomezlavin
1K Followers 1K Following associate professor of philosophy at Purdue @PHILO_Purdue who uses spreadsheets to understand cognition. p.s. working memory isn't real.
vitalik.eth @VitalikButerin
8.0M Followers 551 Following I choose balance. First-level balance. mi pinxe lo crino tcati https://t.co/gCQrmCby7P
CTS @CTS_uk_av
410 Followers 10 Following Centrum pro teoretická studia UK/AV ČR || Center for Theoretical Study, Charles University & The Czech Academy of Sciences
SSE @sse_evolution
13K Followers 304 Following The Society for the Study of Evolution. Promotion of the study of organic evolution & integration of various scientific fields concerned with evolution.
Society of Systematic... @systbiol
10K Followers 91 Following The Society of Systematic Biologists (https://t.co/LQut341j92), publisher of Systematic Biology, sponsor of grants, organizer of conferences.
Trends in Ecology & E... @Trends_Ecol_Evo
27K Followers 371 Following TREE publishes reviews in all areas of ecology & evolution. Automatic posting of new papers only. Check us out on Bluesky @cp-trendsecolevo.bsky.social
Vincent C. Müller @VincentCMueller
2K Followers 351 Following Director, Philosophy and AI Research Centre (PAIR) & A.v.Humboldt Professor @UniFAU Erlangen-Nürnberg
Ruairidh Battleday @RMBattleday
2K Followers 2K Following AI and CogSci Researcher. Founder & President, Thinking About Thinking https://t.co/KPsmnYTTtv https://t.co/ATUc8Czhx4
Institute for Law & A... @law_ai_
3K Followers 14 Following An independent think tank that researches and advises on the legal challenges posed by artificial intelligence.
Global Priorities Ins... @GPIOxford
4K Followers 184 Following The Global Priorities Institute was an interdisciplinary research centre at the University of Oxford.
Toby Ord @tobyordoxford
29K Followers 169 Following Senior Researcher at Oxford University. Author — The Precipice: Existential Risk and the Future of Humanity.
GovAI @GovAIOrg
8K Followers 32 Following We help decision-makers navigate the transition to a world with advanced AI, by producing rigorous research and fostering talent.
Thomas Moynihan @nemocentric
5K Followers 2K Following Historian interested in the future: its perils & potentials | Researcher @ Cambridge Uni's CSER | 📕➜ https://t.co/IlHkep6Df5
Scott Page @Scott_E_Page
8K Followers 592 Following Scott Page is the John Seely Brown Distinguished University Professor at the University of Michigan and an external faculty member of the Santa Fe Institute.
Vermont Complex Syste... @uvmcomplexity
6K Followers 232 Following The Vermont Complex Systems Institute. Describe, Explain, Create, Share. Also: Roboctopus.
Ricard Solé @ricard_sole
18K Followers 934 Following Scientist & skeptic. Dad. Pathologically curious. Complexity, synthetic transitions, liquid brains, Earth Terraformation. ICREA+SFI professor. Author. Humanist.
Seán Ó hÉigeartaig... @S_OhEigeartaigh
8K Followers 2K Following Director of https://t.co/gCEDoKdKBT at Uni of Cambridge | Researching Big Risks, and impacts of AI & emerging tech. Opinions own. help_peer
Santa Fe Institute @sfiscience
69K Followers 1K Following The premier research center for #complexsystems #science. @complexexplorer @sfipress #ComplexityPodcast https://t.co/0m7JBoR6VG
Elizabeth Barnes @BethMayBarnes
6K Followers 395 Following
Vincent Conitzer @conitzer
5K Followers 1K Following AI professor. Director, @FOCAL_lab @CarnegieMellon. Head of Technical AI Engagement, @UniofOxford @EthicsInAI. Author, "Moral AI - And How We Get There."
Brian Christian @brianchristian
5K Followers 612 Following Researcher: @CHAI_Berkeley. PhD: @summerfieldlab, Oxford. Author: The Alignment Problem, Algorithms to Live By (w. @cocosci_lab), and The Most Human Human.
JJ Andrade 🇺🇦 @Jandrade0112
1K Followers 2K Following Cognitive neuroscience and AI interpretability grad student @HarvardGSAS | nonequilibrium physics, AI safety, psychedelic medicine, land taxes
Ulkar @ulkar_aghayeva
3K Followers 835 Following writing about biology, science history and music | composer | https://t.co/PpuV1zhkrg | https://t.co/W6QDqE82Vv | Emergent Ventures '22
Will @Evolving_Moloch
28K Followers 974 Following Evolutionary Anthropology. RA @HSB_Lab. Blogs on violence, magic, rituals, deception. https://t.co/vQh5cd0QCr
Rhys @RhysLindmark
6K Followers 2K Following Exploring what’s next. Helping AI communities as I find my next role. Meliorist. Prev: https://t.co/YVh3JiVjtr | @roote_ | @mitdci | @EthereumDenver
GCR Institute @GCRInstitute
2K Followers 189 Following The Global Catastrophic Risk Institute is a think tank that analyzes the risk of catastrophes severe enough to threaten the survival of human civilization.

















