x_1, x_10, x_2, x_3, x_4, x_5, x_6, x_7, x_8, x_9, 
x_1*x_2-x_3*x_7
-x_1*x_10+x_10*x_9-x_7*x_9
-x_2*x_4-x_3*x_8+x_4*x_8
x_5*x_9+x_6*x_8-x_8*x_9
x_10*x_3-x_10*x_6+x_2*x_6-x_3*x_5
-x_1*x_5+x_4*x_5-x_4*x_7+x_6*x_7
