Page "Fricative consonant" Paragraph 48
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No language distinguishes voiced fricatives from approximants at these places, so the same symbol is used for both.
For the pharyngeals and epiglottals, approximants are more numerous than fricatives.
A fricative realization may be specified by adding the uptack to the letters,.
Likewise, the downtack may be added to specify an approximant realization,.
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