question re a word in JACT Reading Greek

Hello,
I feel I may be stumped in trying to account for the form of a certain word in Section 9-B of the Cambridge JACT Reading Greek text.

Section 9 is about Lysistrata…

My question is about a word in line 5 of Section 9-B (this is the first edition of the JACT text). The word is:

ευ παρεσκευασαμεθα

Again, I am stumped. It appears the word should be in the weak aorist form but it is missing the epsilon prefix, unless somehow the epsilon is part of the enclitic eu? I went through the forms and I find only weak aorist as the possible form.

I hope for some help here if you are interested in this problem! But I will keep going!

The augment is at the end of the παρε at the beginning of the word. The ε replaces the final vowel in παρα.

Thank you, MattK!

I should have seen that. I tell myself to be on the lookout for the need to change the vowel in a prefix. I see now that the verb about which I had a question is given with the original prefix in the vocabulary (para-). I miised it but it is a good learning experience. Will perhaps slow down and review. And thanks very much for the encouragement in the other thread.