In this paper I argue from phonological evidence that haplology is not deletion, but is instead the simultaneous pronunciation of two non-distinct phonological representations.
Haplology also occurs in cases where the elements involved are not segmentally identical.
In conclusion, to the extent that haplology is the only available analysis of the to yuu-na N construction which permits it to be derived as syntactically well-formed, it can be said that neither i nor u is unmarked.