1/2 a^{}_{a0,a1,v0} b^{a2,a3,v1}_{} gamma1^{a1}_{a3} gamma1^{a0}_{a2} a+(v0) a-(v1)
+1/4 a^{}_{a0,a1,v0} b^{a2,a3,v1}_{} lambda2^{a0,a1}_{a2,a3} a+(v0) a-(v1)
+a^{}_{a0,a2,v0} b^{a1,a3,v1}_{} gamma1^{a2}_{a3} a+(a0) a+(v0) a-(v1) a-(a1)