Keeping a side count

[dude]

I am counting hi/lo with I18 and Fab4, and I want to keep a seperate count for 7s so I can play a super sevens game. I know many think that's a worthless pursuit and a waste of effort, but I just want to know how I can properly keep that count. What kind of strategies or devices do people use to count one card on the side while maintaining an accurate main count?

 

[SammyBoy]

Dude,

I've heard other people mentioning using letters, maybe that is the way to do it? The alphabet would work well for a 6 deck game, although I guess that conversion gets tough when you have to convert the letter to a number ( A=1, B=2,..., Z=26).