Abacad, Efigy, Hiji-He-Hiji-Ho, ...

So a long time ago I was in a small improv group with some friends. We did a warm-up exercise that involved going through phrases that represented parts of the alphabet. It started out something like this...

Abacad! (for ABCD)
Efigy! (EFG)
Hiji-He-Hiji-Ho (HIJ)
Meckalecka-Hi-Mecky-Hiney-Hey (or was it Ho?) (KLMNO)
. . .

Sometimes people would just randomly yell "Abacad!" and we'd all start. No, this has nothing to do with Phil Collins and/or Genesis, and yes, we were all a bunch of geeks.

Anyway, it often gets in my head... but I don't really remember much of it. Has anyone heard of this before? Does anyone know how it's supposed to go? Most importantly, does anyone know the whole thing?