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