a^{c0,a0}_{c3,v0} b^{c1,c3}_{a1,v1} c^{a2}_{c2} gamma1^{a1}_{a2} a+(c2) a+(v0) a+(v1) a-(a0) a-(c1) a-(c0)
+a^{c0,a1}_{c3,v0} b^{c1,c3}_{a2,v1} c^{a0}_{c2} eta1^{a2}_{a1} a+(c2) a+(v0) a+(v1) a-(a0) a-(c1) a-(c0)