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