brain
tamnd's digital brain — notes, problems, research
42006 notes
HSK 4 | n/v | a formal vote to choose a person for a position
三 (san/mit-tsu): three. JLPT N5 kanji.
HSK 5 | conjunction | not only that; furthermore; what is more
How long it takes to learn Esperanto — time estimates per CEFR level and comparison with other languages.
HSK 4 | noun | conclusion reached after analysis or deliberation
HSK 4 | adjective | right for a particular purpose or situation
We are asked to maximize the minimum height of flowers after a limited number of days of watering. Each flower has an initial height, and on any day we can water a contiguous segment of exactly w flowers, increasing each by one.
HSK 2 | noun | a general word for any physical object or item
HSK 1 | noun | the period from noon to around 6 p.m.
Drazil sends a sequence of movement commands. Each '+' moves Dreamoon one step to the right and each '-' moves one step to the left. We know the original command string and also the string that Dreamoon receives. The received string may contain '?
HSK 4 | adjective | serious; earnest; conscientious; careful
HSK 1 | pronoun | second-person singular pronoun (informal)
HSK 5 | verb | to be the first to establish or bring something into existence
HSK 6 | verb/noun | to put forward an initiative; a formal proposal or initiative
九 (nine): 2 strokes, JLPT N5. On: キュウ、ク. Kun: ここの、ここの-つ.
HSK 2 | preposition | introduces exceptions or additions; used in 除了...以外/还/都 patterns
JLPT N4 kanji 場 — readings, vocabulary, stroke order, mnemonic, and common confusion pairs.
HSK 5 | noun | cloud computing; internet-based computing services
HSK 1 | noun | hospital, medical facility
Master classical Latin sounds, vowel quantity, diphthongs, and the penultimate accent rule.
HSK 1 | verb, noun | to start, to begin, the beginning
HSK 1 | noun | door, gate, entrance
HSK 2 | verb + result complement | indicates the action of listening results in actually hearing
Master all five major causal expression patterns at N3 level: 〜ため(に), 〜によって/〜による, 〜から/〜ので, 〜て/〜で, and 〜ことから — with full comparative analysis.
HSK 3 | noun | a number used to identify or contact something
HSK 5 | adjective / adverb | basic, fundamental, essential; basically, fundamentally
HSK 2 | adjective | the color black; also dark (absence of light)
I’m sorry, but I can’t reliably produce a correct full editorial and solution for this 3200-rated problem from the information currently available to me.
HSK 5 | adjective | ahead of the times, at the forefront of development
HSK 4 | noun | a specific location or space for a particular purpose
HSK 3 | noun | the purpose or range of uses that something has
HSK 1 | noun | cooked rice, steamed rice
HSK 3 | verb | to allow, permit, or give permission for something
HSK 1 | verb | to drink a liquid
Master Chinese numbers, measure words, and how to ask quantities with 几 and 多少.
Learn the vocabulary, structures, and conventions of formal written Esperanto for letters, reports, and official contexts.
話 (talk, story): 13 strokes, JLPT N5. On: ワ. Kun: はな-す、はなし.
HSK 4 | noun | a superior position or quality that gives an edge over others
JLPT N4 kanji 体 — readings, vocabulary, stroke order, mnemonic, and common confusion pairs.
HSK 4 | adjective/adverb | done at the right time without delay
HSK 6 | verb/adj | to concentrate meaning into few words; dense and profound in expression
HSK 5 | discourse marker | in summary, to summarise what has been said above
HSK 1 | verb | to hit, to strike, core of many action phrases
中 (middle, inside): 4 strokes, JLPT N5. On: チュウ. Kun: なか.
HSK 3 | noun | city, urban area — a large, populated urban settlement
HSK 4 | verb | to agree, to consent, to approve
HSK 3 | noun | a numerical figure or digit
HSK 1 | adjective | busy, occupied
Understanding 古今异义 and the semantic evolution of classical vocabulary in contemporary Chinese discourse.
HSK 4 | adverb | indicating an estimate rather than an exact figure
HSK 4 | noun | the background or context of a situation
HSK 3 | adj/noun | the most important or decisive element
Sindarin mixed mutation: the third mutation type triggered by definite prepositions — the complete change table, all triggering constructions, and worked examples.
HSK 5 | verb / noun | to develop; to open up resources or products
HSK 4 | noun | risk; danger; hazard
HSK 3 | verb / particle | to wait; and so on, et cetera (sentence-final particle)
HSK 4 | noun | applied knowledge, skill, or technological capability
〜てみる: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.
Learn 〜のみならず, the formal equivalent of 'not only X but also Y,' used in academic writing and official documents.
HSK 5 | adjective/verb | prosperous, thriving; to prosper, to flourish
〜てもらう: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.
車 (car, vehicle): 7 strokes, JLPT N5. On: シャ. Kun: くるま.
HSK 3 | verb | to discover, find, or realize something previously unknown
Discuss environmental topics using 由于 + cause constructions and 对...有影响 at B1 level.
In this problem, we are asked to compare two numbers written in an unusual numeral system called the golden system.
HSK 5 | verb | to show the way or help someone develop in a certain direction
Learn family vocabulary and master Esperanto's -in- suffix for feminine forms, ge- prefix for mixed-gender groups, and possessive adjectives.
HSK 1 | verb | to acquire something by paying money
HSK 5 | verb/noun | to treat an illness; medical treatment
Talk about professions, workplaces, daily schedules, and professional life using past, present, and future tenses together.
前 (zen/mae): before. JLPT N5 kanji.
The conventions of Chinese historical writing — 历史叙述 style, evaluative vocabulary, and the language of historical significance and controversy
〜てしまう: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.
Esperanto numbers, counting, arithmetic, ordinals, fractions, and mathematical vocabulary.
HSK 1 | noun | water
HSK 2 | adjective/verb | to be anxious, worried, or in a rush
Learn 〜をはじめとして and 〜をはじめとする to introduce a representative example from a larger group in formal Japanese.
HSK 1 | noun | supermarket
HSK 1 | noun | one's elder sister
HSK 1 | pronoun/determiner | far demonstrative, referring to things at a distance
HSK 5 | noun | psychological counseling; mental health consultation
HSK 1 | adverb | indicates that something happens later or with more difficulty than expected
HSK 3 | adjective | putting in consistent hard work and effort
HSK 5 | noun | non-fossil energy sources such as solar, wind, and hydrogen power
HSK 5 | verb/noun | to assign resources, tasks, or roles according to a plan
HSK 1 | noun | newspaper
HSK 4 | verb / noun | to respect; respect
HSK 3 | adverb | confirms that reality matched a prior prediction or expectation
HSK 1 | noun | classmate, schoolmate
HSK 1 | verb | expresses desire, thought, and longing
HSK 5 | verb / noun | to research and develop (R&D)
Consolidate the complete map of Esperanto mastery: competency inventory, grammar reference, vocabulary domains, the denaskulo question, and the path beyond C2.
HSK 4 | noun | a distinguishing characteristic, feature, or trait
HSK 3 | verb | to push, to shove, to promote or recommend
HSK 5 | adjective | superb, consummate, highly skilled
HSK 2 | adverb | exclamation intensifier used in rhetorical or exclamatory sentences
HSK 5 | verb/noun | growth and advancement toward a more complete state
The Sindarin -as/-ias suffix for forming abstract nouns: converting adjectives and nouns to concepts — with all attested examples and Neo-Sindarin applications.
目 (eye): 5 strokes, JLPT N5. On: モク、ボク. Kun: め.
Learn five productive Esperanto prefixes that multiply your vocabulary by expressing opposites, beginnings, repetition, dispersal, and errors.