For FFF - The Combo's are...
Easy (Generally when your betting at max of $3 and you only bet 1) - A, A, A, A, A, A, A, A, A, A, A -- A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A
Medium (Second set of bets and you keep it low) - A, B, A, B, A, B, A, B, A, B, A.-- A, B, A, B, A, B, A, B, A, B, A, B, A, B, A, B, A, B, A, B, A
Hard (3rd Set of Bets) - A, B, A, Y, A, B, A, Y, A, B, A -- A, B, A, Y, A, B, A, Y, A, B, A, B, A, Y, A, B, A, Y, A, B, A
And Finally A, B, A, Y, A, X, A, B, A, Y, A. -- A, B, A, Y, A, X, A, B, A, Y, A. B, A, Y, A, X, A, B, A, Y, A..
When you start betting $100 it'll double up the last one, so be wary of that, but mainly FFF comes down to timing. I generally end up just watching my fingers not the screen.