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Acronyms and abbreviations are formed by putting together the initial letters of some

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Words and phrases like now, yesterday, next week, in three day, etc. are called discourse deixis.()

In telegraphic stage, children use single words to represent various meanings.()

Sounds are said to be in contrastive distribution if they appear in the same environment.()

[l] [？] [？] are called phonemes of the phoneme |l|.()