-1/4 a^{v2}_{a1,v0,v1} b^{a3,a4}_{a0,a2} lambda2^{a1,a2}_{a3,a4} a+(a0) a+(v0) a+(v1) a-(v2)
-1/4 a^{v2}_{a3,v0,v1} b^{a2,a4}_{a0,a1} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(v0) a+(v1) a-(v2) a-(a2)