2.4 German
/CH/→[x]∕ V ＿＿
[+back]
/CH/→[c]∕ V ＿＿
[+front]
preceded by a ‘back’ vowel, voiceless ‘velar’ fricative [x] realizes
preceded by a ‘front’ vowel, voiceless ‘palatal’ fricative [c] realizes
therefore,
[x] and [c] are in complementary distribution,
and they are allophones of the same phoneme;
this is an assimilation rule. (homorganic fricative assimilation rule)
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