Vowels:

Vowels can be categorized into two Soft (shown in green) and Hard (shown in violet). But there are four types of vowel as shown in table 1-4 above, namely Basic, Circular, Extended and Extended circular. The  four types of soft vowel sets are; Basic (a-e-i-o-u-ou), Circular (ai-ei-oi-ui), Extended (aa-ee-ii-oo-uu) and Extended Circular (aai-eei-ooi-uui-ooi) as shown in green color above. 

Each soft set is accompanied by a stressed set which are; Basic (á-é-í-ó-ú-óu), Circular (ái-éi-ói-úi) and Extended that includes three variations (aá-eé-ií-oó-uú), (áa-ée-íi-óo-úu) and (áá-éé-íí-óó-úú). Also there are Extended Circular that includes two variations (aái-eéi-oói-uúi-oói) and (áai-éei-óoi-úui-óoi).