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