Remove all 'r's unless it begins a word. Any word that lost an 'r' at the end and now has an 'e' or 'o' at the end has the 'e' or 'o' changed to an 'a'. The first 'e' or 'o' in a word gets changed to an 'a'. Any word that ends with an 'a' has an 'r' tacked on.
Many people forget the 'r' rules.
Maybe I'll drive it fast through Harvard Yard- nah, that's a bad idea. Maaybe I'll drive it faast thraaugh Haavaad Yaad- naah thaat's aah baad ideaar.