a^{a1,v1}_{a0,v0} b^{a3}_{a2} c^{}_{} eta1^{a2}_{a1} gamma1^{a0}_{a3} a+(v0) a-(v1)
+a^{a1,v1}_{a0,v0} b^{a3}_{a2} c^{}_{} lambda2^{a0,a2}_{a1,a3} a+(v0) a-(v1)