% 2
-e1*c+c*e1,
   e1*e1-c*e1,
   e1*g1,
   -e2*c+c*e2,
   e2*e2-c*e2,
   e2*g2,
   -g1*c+c*g1,
   g1*e1,
   g1*g1-c*g1,
   -g2*c+c*g2,
   g2*e2,
   g2*g2-c*g2,
   
