I'm having a little trouble with the random function.

In the first line, I want a random integer between 1 through 4, easy enough.

In the second line, and every line thereafter, I want a random integer 1 through 4... however, I do not want an 'opposing number'. I can roll 1 twice in a row, but if I roll '1' I cannot roll '2', and vice versa. 3 and 4 are also opposites.

Help?