C11 := 1/2240*lambda[4]*v[4]^9*v[3]-1/40*lambda[4]*v[4]^5*v[3]^3-1/20*lambda[4
]*v[4]*v[3]^5+1/140*lambda[4]*v[4]^7*v[2]+lambda[4]*v[4]*v[3]*v[2]^2;