1/4 a^{c0}_{a0} b^{a1,a2}_{c1,c2} c^{v0,v1}_{c3,a3} eta1^{a3}_{a2} gamma1^{a0}_{a1} a+(c1) a+(c2) a+(c3) a-(v1) a-(v0) a-(c0)
-1/8 a^{c0}_{a0} b^{a1,a2}_{c1,c2} c^{v0,v1}_{c3,a3} lambda2^{a0,a3}_{a1,a2} a+(c1) a+(c2) a+(c3) a-(v1) a-(v0) a-(c0)