- verbs beggining with p regularly double... those with l m v or c might get the doubvle
- verbs with a lost consonant f or c may take the consonantal augment instead of the syllabic
- initial c implies contractions (exo => eixov)
- initial f contraction may or may not take place
he gives examples for 4 whose origin i was not able to discover. i note that in andanw both things may happen eadon for ...

News of Homeric Greek and Pharr's Homeric Greek - A Book For Beginners