Vowel hierarchy in modern greek

[mafke]

Some years ago I saw a textbook on modern greek that had a vowel hierarchy that determined which vowels are deleted or retained when one word ends with a vowel and the next one begins with a vowel.

It was about pronounced vowels not written (so I'l use the spoken vowels in examples rather than the written ones ine instead of einai etc)

All I remember was that a was at the top, which explained why 'pu tha ine' becomes 'pu thane'.

Does this ring any bells and can anyone list the rest of the hierarchy or offer other principles governing vowel deletion?

[md0]

a > o > u > e > i

[mafke]

a > o > u > e > i

ευχαριστώ