a^{a0}_{c0} b^{v0}_{a1} c^{a3,v1}_{c1,a2} eta1^{a2}_{a0} gamma1^{a1}_{a3} a+(c0) a+(c1) a-(v1) a-(v0)
+a^{a0}_{c0} b^{v0}_{a1} c^{a3,v1}_{c1,a2} lambda2^{a1,a2}_{a0,a3} a+(c0) a+(c1) a-(v1) a-(v0)