-1/2 a^{v0}_{a0} b^{a1,v1}_{c0,c1} c^{a3}_{a2} eta1^{a2}_{a1} gamma1^{a0}_{a3} a+(c0) a+(c1) a-(v1) a-(v0)
-1/2 a^{v0}_{a0} b^{a1,v1}_{c0,c1} c^{a3}_{a2} lambda2^{a0,a2}_{a1,a3} a+(c0) a+(c1) a-(v1) a-(v0)