xL regressive assimilation
tonal spread
[L ..] /xL/ > [L .] [xL .] /xL/ / (lex: kèe _) (word _)
If a heavy foot hosting a L toneme is followed by xL, the xL tone assimilates its final syllable. This rule concerns only one word, kèe 'occiput', e.g.: kèȅ tȁ 'at the occiput'.