a^{c1,v0}_{c0,a0} b^{a1,v1}_{c2,c3} c^{c3}_{a2} eta1^{a2}_{a1} a+(c0) a+(c2) a+(a0) a-(v1) a-(v0) a-(c1)
+a^{c1,v0}_{c0,a1} b^{a2,v1}_{c2,c3} c^{c3}_{a0} gamma1^{a1}_{a2} a+(c0) a+(c2) a+(a0) a-(v1) a-(v0) a-(c1)
+1/2 a^{c0,v0}_{c3,a0} b^{a1,v1}_{c1,c2} c^{c3}_{a2} eta1^{a2}_{a1} a+(c1) a+(c2) a+(a0) a-(v1) a-(v0) a-(c0)
+1/2 a^{c0,v0}_{c3,a1} b^{a2,v1}_{c1,c2} c^{c3}_{a0} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(a0) a-(v1) a-(v0) a-(c0)