random / lists

[Paul Rubin]

"M. Clift" <noone at here.com> writes:
> What I want is a system that controls the direction in a generated list. If
> the user selects a number a letter is choosen for each number from at random
> from an array. That's fine and easy to do. The hard part is, is that no
> letter can be repeated with only one letter interveining and the letters can
> only follow each other under certain rules.

Is this a homework assignment?