1/4 a^{}_{a0,a1,v0,v1} b^{a2,a3}_{} gamma1^{a1}_{a3} gamma1^{a0}_{a2} a+(v0) a+(v1)
+1/8 a^{}_{a0,a1,v0,v1} b^{a2,a3}_{} lambda2^{a0,a1}_{a2,a3} a+(v0) a+(v1)
+1/2 a^{}_{a0,a2,v0,v1} b^{a1,a3}_{} gamma1^{a2}_{a3} a+(a0) a+(v0) a+(v1) a-(a1)