> as lemmas

1968 N. Chomsky & M. Halle Sound Pattern Eng. iv. 305 Low sounds are produced by lowering the body of the tongue below the level that it occupies in the neutral position; nonlow sounds are produced without such a lowering of the body of the tongue.

1991 Canad. Jrnl. Linguistics 36 31 The consonantalization of unaccented nonlow vowels in hiatus, which created the C + yod combinations, can be dated back to the first and second centuries.

1999 J. R. Craddock in R. J. Blake et al. Ess. in Hispanic Linguistics vi. 58 Classical Latin long vowels remain unchanged as to the high/low parameter; non-low short vowels are opened one step, so that /i/ merges with /e:/.