x_1, x_10, x_11, x_12, x_13, x_14, x_15, x_16, x_2, x_3, x_4, x_5, x_6, x_7, x_8, x_9, 
2*x_10*x_14+8*x_10*x_16+x_15*x_9
8*x_14*x_7+x_15*x_8+2*x_16*x_7
3*x_10*x_15+4*x_14*x_9+2*x_15*x_8+6*x_16*x_9
6*x_14*x_8+3*x_15*x_7+2*x_15*x_9+4*x_16*x_8
2*x_1*x_14+2*x_1*x_16+x_12*x_2+x_13*x_3+1
2*x_12*x_4+x_13*x_5+4*x_14*x_2+x_15*x_3+2*x_16*x_2
x_12*x_5+2*x_13*x_6+2*x_14*x_3+x_15*x_2+4*x_16*x_3
3*x_12*x_7+x_13*x_8+6*x_14*x_4+x_15*x_5+2*x_16*x_4
3*x_10*x_13+x_12*x_9+2*x_14*x_6+x_15*x_5+6*x_16*x_6
2*x_12*x_8+2*x_13*x_9+4*x_14*x_5+2*x_15*x_4+2*x_15*x_6+4*x_16*x_5
