In British English dialectology, prevocalic in accents that distinguish "cot" and "caught" is analyzed as + , not since the non-rhotic dialects that have maintained the distinction feature two vowels corresponding to historic before intervocalic : and –, both of which contrast with . If is considered to be the contemporary reflex of , the merger is incomplete in the intervocalic position (at least in Received Pronunciation) and so "moral" and "oral" do not rhyme: ("warring", however, was once and is because it is derived from "war" ). Before the loss of rhoticity, "moral" and "war" had the same stressed vowel , and the latter was lengthened and raised and so merged with : , which gave rise to the three-way distinction between prevocalic , and as in "moral", "warring", and "oral" (excluding the marginal , which is restricted to compound words) because of the derived forms such as "warring" (compare the wholly-holy split, which results in creation of a separate phoneme before intervocalic ). However, the change did not affect all derived forms, such as "warrior" .