Permutation and combination problem, (12 *1/2 *1) * (13 *12 *1/3 *)

Don't be such a goal of your own, you should have a basis.

This is a concrete algorithm.

Use the most traditional method: 12 kinds of main materials, and you can choose several kinds of materials:110+9+8+7+6+5+4+3+2+1= 66 kinds of formulas.