@Rouben Rostamian  Thanks, I appreciate your help.

@Carl Love thanks Carl, ok, I got it to work, but maybe you can help me all the way. Now I need to take the first member of each set and make it a power of s, and then the second a power of t, and disregard the rest. so :

s^a*t^b/(a!b!c!d!e!), so for example the set [2,0,3,0,0] will give (s^2)*(t^2)/(2!0!3!0!0!), and the set [1,2,2,1,0] will give (s^1)*(t^2)/(1!2!2!1!0!)