x10, x9, x8, x7, x6, x5, x4, x3, x2, x1, 
x10^4+x10^2-x9
x9^4+x9^2-x8
x8^4+x8^2-x7
x7^4+x7^2-x6
x6^4+x6^2-x5
x5^4+x5^2-x4
x4^4+x4^2-x3
x3^4+x3^2-x2
x2^4+x2^2-x1
x1^4-2
