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