hello to everybody. i try to create an algorithm tha for any number [0,26] find all the subset of the alphabet. for example if you give to the programm the number 4 the programm print out {} {a} {b} {a,b} {c} {a,c} {b,c} {a,b,c} {d} {a,d} {b,d} {a,b,d} {c,d} {a,c,d} {b,c,d} {a,b,c,d} i have been thinking something.i would like to hear any ideas. thanks for any reply