a^{c1,a0}_{c0,c3} b^{c3,a1}_{a2,v0} c^{a3}_{c2} gamma1^{a2}_{a3} a+(c0) a+(c2) a+(v0) a-(a1) a-(a0) a-(c1)
-a^{c1,a2}_{c0,c3} b^{c3,a0}_{a3,v0} c^{a1}_{c2} eta1^{a3}_{a2} a+(c0) a+(c2) a+(v0) a-(a1) a-(a0) a-(c1)