brain

HSK 3 | adverb | refers to a subset within a previously mentioned group or set

HSK 3 | verb | to send, to emit, to issue, to develop — multi-meaning character

HSK 5 | noun | cybersecurity, protection of computer networks and data

The game is played on a grid formed by n horizontal sticks and m vertical sticks. Every horizontal stick intersects every vertical stick, creating n m intersection points. On a turn, a player chooses one remaining intersection point.

A comprehensive review of all A2 grammar patterns and key vocabulary from HSK 3, with integrated exercises for exam preparation.

Complete N3 grammar reference: ~200 patterns including conjunctions, conditions, degree expressions, formal structures, and nuanced patterns that distinguish N3 from N4. Each pattern includes structure, meaning, and 3+ example sentences.

Complete N4 grammar reference: ~150 patterns with structure formulas, meanings, 3+ example sentences each (Japanese, romaji, English), and notes on common mistakes.

HSK 5 | noun | typhoon, tropical cyclone

HSK 5 | noun / adjective | diplomacy, foreign affairs; diplomatic

HSK 5 | noun | a medical institution providing inpatient and outpatient care

HSK 5 | noun/verb | initiative; proposal; to put forward a proposal or call to action

Complete guide to all major Japanese particles: は が を に で から まで と も の か ね よ — with meaning, usage rules, and example sentences.

HSK 3 | conjunction | only if, only when — used in 只有...才... pattern

HSK 5 | noun/verb | coercive measures imposed to punish or compel compliance

HSK 5 | noun | infectious disease; communicable disease; contagious illness

HSK 6 | verb/adj | to refine to a high degree; precise and economical in expression

JLPT N4 kanji 会 — readings, vocabulary, stroke order, mnemonic, and common confusion pairs.

Complete JLPT N1 exam prep guide: format, pass rates, section strategies, 1-year study plan from N2, 100 most-tested grammar patterns, keigo at N1, and common exam traps.

Learn to describe the weather and seasons using adjective predicates and the question 怎么样.

Master Esperanto's location and movement prepositions, and learn the crucial rule for adding -n to show direction versus static position.

Master classical Latin sounds, vowel quantity, diphthongs, and the penultimate accent rule.

HSK 3 | adjective | unwilling to work or make effort

HSK 5 | adjective | displaying initiative, enthusiasm, or a constructive attitude

HSK 2 | verb-object phrase | to run or go jogging as an activity

We are given an undirected graph and, for every vertex, the parity of how many times that vertex must appear in a walk. A walk is represented by a sequence of vertices. Consecutive vertices in the sequence must be connected by an edge.

HSK 4 | conjunction | introducing a contrast or exception

A rigorous analysis of Esperanto's participial system — the -ata/-ita controversy, compound tenses, participial nouns, and verbal adjectives with full semantic precision.

HSK 2 | noun | noodles, a staple food made from wheat flour

N1 grammar pattern 〜ながらも: expressing contrast between two simultaneous states — even though, despite, all the while.

〜なら: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.

HSK 4 | verb | to bring a goal or dream into reality

HSK 5 | adjective | easily affected, responsive, or requiring careful handling

HSK 3 | noun | a public outdoor space for recreation and leisure

HSK 4 | noun | a deeply held idea, concept, or way of thinking

Learn Esperanto idiomatic expressions, proverbs, fixed collocations, and discourse idioms that native-level speakers use in authentic communication.

HSK 4 | verb / adjective | bringing something to a higher or complete standard

Learn 〜うちに (while, before it's too late) — the N3 temporal pattern expressing a window of opportunity.

HSK 4 | verb | to find a solution or resolve a problem

HSK 2 | adverb | exclamation intensifier used in rhetorical or exclamatory sentences

HSK 5 | adjective | restricted in quantity, scope, or degree; not unlimited

HSK 5 | verb | to release; to issue officially; to publish

HSK 2 | noun | a general word for any physical object or item

HSK 4 | verb / noun | giving assistance, backing, or resources to someone or something

校 (school): 10 strokes, JLPT N5. On: コウ. Kun: none.

Esperanto vocabulary for jobs, workplace, professional activities, and employment.

大 (dai/tai/oo-kii): big. JLPT N5 kanji.

Codeforces 465B: Inbox (100500)

HSK 6 | n | the intrinsic qualities, depth, or connotation of a person, concept, or work

HSK 5 | noun | a fixed, oversimplified image or idea about a group of people

HSK 3 | adjective | feeling joyful and pleased

耳 (ear): 6 strokes, JLPT N5. On: ジ. Kun: みみ.

HSK 2 | verb + result complement | indicates searching resulted in actually finding something

HSK 5 | noun phrase | the health of the population managed through organized societal efforts

比べる (くらべる / kuraberu): to compare. N4 level Japanese vocabulary.

HSK 5 | adjective | clearly noticeable, conspicuous, or substantial in degree

Consolidate all B1 grammar and vocabulary, review CEFR B1 can-do statements for Esperanto, and prepare for the B2 level.

Complete N2 grammar reference: 200+ formal and written patterns with structures, nuance comparisons, and example sentences in formal register.

We are asked to help Captain Marmot organize his regiments of moles so that each group of four forms a perfect square on a plane. Each mole starts at a position (xi, yi) and has a “home” at (ai, bi).

HSK 4 | verb | to make something available to someone who needs it

HSK 6 | verb | to interpret and explain the meaning of a text, concept, or phenomenon

HSK 5 | adjective/verb | conspicuously noticeable; to highlight or protrude

HSK 4 | noun | an established set of rules or organizational structure

HSK 4 | adjective | covering a wide range or affecting many people or areas

HSK 1 | verb / preposition | indicates location, either as main verb or as preposition before a place

HSK 3 | verb | to formally request a day off from work or school

Common Japanese sentence patterns organized by JLPT level N5 through N1, with structure, usage notes, and example sentences for each pattern.

HSK 5 | adjective | having a quality or style that belongs only to itself; unique

HSK 4 | noun/verb | a planned estimate of income and expenditure

HSK 4 | adjective | concise, brief, and free of unnecessary content

しかし (しかし / shikashi): however, but. N4 level Japanese vocabulary.

道 (dou/tou/michi): road. JLPT N5 kanji.

HSK 4 | adjective | the most important or central element

HSK 1 | conjunction | introduces a contrast or exception

HSK 3 | interjection / verb | a cheer of encouragement, or to add fuel/gasoline

HSK 5 | noun | a physical or mental feature indicating a condition or disease

HSK 5 | noun | one's level of formal education or academic credentials

左 (sa/hidari): left. JLPT N5 kanji.

Learn how Latin adjectives agree with nouns in gender, case, and number using the bonus/bona/bonum model.

HSK 5 | verb / noun | to assess or appraise systematically; an evaluation

HSK 3 | verb | to hang something up or be suspended

HSK 3 | noun | the atmosphere or mood of a place or situation

An immersive study of Esperanto's imagined homeland — its literature, music, film, online culture, native speakers, and annual congress life.

Master all uses of the -n ending: direct object, direction, time measure, and flexible word order.

Narrate travel experiences using 经历 narrative patterns and vocabulary for memorable moments, local customs, and personal impressions at B1 level.

HSK 4 | adjective | having a quality or character that belongs to no other person or thing

読 (read): 14 strokes, JLPT N5. On: ドク、トク、トウ. Kun: よ-む.

HSK 1 | adverb | negates verbs and adjectives for present, future, or habitual

HSK 4 | noun | a planned project, item, or program

HSK 4 | noun | the deeper value or significance of something

HSK 3 | noun | a particular side or dimension of a topic or issue

How long it takes to learn Esperanto — time estimates per CEFR level and comparison with other languages.

Learn three conditional structures: 如果...就 for general conditions, 只要...就 for sufficiency, and 只有...才 for necessity.

Mastering 之、乎、者、也 and the grammar of classical Chinese in modern scholarly and literary contexts.

HSK 5 | adjective / verb | clear and unambiguous; to make something explicitly clear

Vasya starts with a certain number of sock pairs. Every morning he uses exactly one pair, and that pair is gone forever at the end of the day. There is one special event: after every day whose number is a multiple of m, his mother buys him one new pair of socks.

HSK 4 | verb / noun | to evaluate; to assess; an assessment

HSK 2 | phrase | standard response to thanks; also means 'don't be polite'

All Sindarin dictionaries compared — Parf Edhellen, Eldamo, Hiswelókë — with guidance on when to use each and how to interpret source period labels.

Master 〜に従い and 〜に従って to express compliance with rules, instructions, or gradual change in formal Japanese.

HSK 3 | adverb | marks a contrast or reversal between expectation and reality