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Upside-down marks, simple in the era of hand typesetting, were originally recommended by the Real Academia Española (Royal Spanish Academy), in the second edition of the Ortografía de la lengua castellana (Orthography of the Castilian language) in 1754 [3] recommending it as the symbol indicating the beginning of a question in written Spanish—e.g. "¿Cuántos años tienes?"
Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [4] As of December 2021, Quizlet has over 500 million user-generated flashcard sets and more than 60 million active users. [5]
The Leitner system [1] [2] [3] is a widely used method of efficiently using flashcards that was proposed by the German science journalist Sebastian Leitner in 1972. [ 4 ] [ 5 ] It is a simple implementation of the principle of spaced repetition , where cards are reviewed at increasing intervals.
The letters Ă, Â, Ê, and Ô are found on what would be the number keys 1– 4 on the US English keyboard, with 5– 9 producing the tonal marks (grave accent, hook, tilde, acute accent and dot below, in that order), 0 producing Đ, = producing the đồng sign (₫) when not shifted, and brackets ([]) producing Ư and Ơ.
Paper flashcards have been used since at least the 19th century. Reading Disentangled (1834), a set of phonics flashcards by English educator Favell Lee Mortimer, is believed by some to be the first known usage of flashcards. [5] A single-sided hornbook was also known to have been used for early literacy education.
The Spanish language is written using the Spanish alphabet, which is the ISO Latin script with one additional letter, eñe ñ , for a total of 27 letters. [1] Although the letters k and w are part of the alphabet, they appear only in loanwords such as karate, kilo, waterpolo and wolframio (tungsten or wolfram) and in sensational spellings: okupa, bakalao.
ISO 639 is a standardized nomenclature used to classify languages. [1] Each language is assigned a two-letter (set 1) and three-letter lowercase abbreviation (sets 2–5). [ 2 ] Part 1 of the standard, ISO 639-1 defines the two-letter codes, and Part 3 (2007), ISO 639-3 , defines the three-letter codes, aiming to cover all known natural ...
en-US – English as used in the United States (US is the ISO 3166‑1 country code for the United States) [2] es – Spanish, as shortest ISO 639 code. es-419 – Spanish appropriate for the Latin America and Caribbean region, using the UN M.49 region code; ISO 639‑1: Two-letter code system made official in 2002, containing 136 codes at the ...