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