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