x20, x19, x18, x17, x16, x15, x14, x13, x12, x11, x10, x9, x8, x7, x6, x5, x4, x3, x2, x1, 
x20^30-x19
x19^30-x18
x18^30-x17
x17^30-x16
x16^30-x15
x15^30-x14
x14^30-x13
x13^30-x12
x12^30-x11
x11^30-x10
x10^30-x9
x9^30-x8
x8^30-x7
x7^30-x6
x6^30-x5
x5^30-x4
x4^30-x3
x3^30-x2
x2^30-x1
x1^30-2
