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