Question
"Suspicious pairs" are pairs of sounds that should be given special attention in working out the phonemic inventory of a language because they are phonetically similar, and/or because they commonly interact in phonological processes found in human languages. Grouping the dorsals by voicing, we may view the voiceless set [k c] as a suspicious pair; the voiced dorsals [g ɟ] would likewise be a suspicious pair. We are suspicious when we find both dorsals and velars in the sound inventory of a language, because sound processes that derive one from the other (usually palatals from velars) are typologically very common, although the conditioning factors can be quite different from language to language
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http://www.laits.utexas.edu/phonolog...rsal_pal1.html
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