okay, this is probably the easiest question in the world..... but I'm STUMPED..... and for the life of me can't figure this out.... what does the "E" in HORSE stand for?

H - Holdem

O - Omaha

R - Razz

S - Stud (7 card)

E - ????

I know we played 7 card stud hi/lo for the "E" in the last horse tourney I played... but I can't figure out what E stands for? lol