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