1/4 a^{a1,a2}_{a0,a3} b^{c0,a4,v0,v1}_{} gamma1^{a3}_{a4} a+(a0) a-(v1) a-(v0) a-(a2) a-(a1) a-(c0)
+1/4 a^{a0,a3}_{a1,a2} b^{c0,a4,v0,v1}_{} lambda2^{a1,a2}_{a3,a4} a-(v1) a-(v0) a-(a0) a-(c0)