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