phoneme

A phoneme is one of the units of sound (or gesture in the case of sign languages, see chereme) that distinguish one word from another in particular language. by wiki

1. plementary distribution?

1.1 Yes. Are the sounds phonetically similar?
1.1.1 Yes. They are allophones of the same phoneme.
1.1.2 No. They belong to two separate phonemes.

1.2 No. Does substituting one soung for the other change meaning?
1.2.1 Yes. Refer to 1.1.2
1.2.2 No. They are in free variation.

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