ου
formed by εο, οε, οο (ou baby)
ει
formed by εε (2 eggheads equals egghead intelligence)
ω
formed by ω or ο with anything (except rule 1)
α
formed by αε . Also ᾳ- formed by αει
η
formed by εα. also ῃ formed by εαι
οι
formed by οει (rock plus eye equals oy!)
Contraction of diphthongs with same vowel
Simplify (εει = ει OR οου = ου)
Contraction of diphthongs with different vowel
They contract ( αει = ᾳ OR εου = ου)