ASAP

ASAP is a Vowel System that was proposed in the Vowel Ballot

The ASAP (as simple as possible) proposal was posed as follows:"a (/a/-[ä]), i (/i/), u (/ɯ/-[ɯᵝ]), e (/e/-[e̞]), o (/o/-[o̞]), just the (short) vowels of Japanese.""It's possible to make them longer by just, pronouncing a sequence of two mora (again, as in Japanese); let's write them aa, ii, uu, ee,oo."