f := 0 twith symmetries
f := D f *f*q1 + D f*D D f*q3 + D f*f *q5 + D D f *q7 + D D f*D f*q4
s 2 x 2 1 2 2 x 1 2 2x 1 2 1
+ D f *f*q2 + D f*f *q6 + f *q8
1 x 1 x 3x
SYSTEM & SYMMETRY DO NOT SATISFY MINIMAL REQUIREMENTS!