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