-1/2 a^{c0,c1}_{c3,a0} b^{c3,a2}_{c2,a1} c^{v0}_{a3} eta1^{a3}_{a2} a+(c2) a+(a0) a+(a1) a-(v0) a-(c1) a-(c0)
+1/2 a^{c0,c1}_{c3,a2} b^{c3,a3}_{c2,a0} c^{v0}_{a1} gamma1^{a2}_{a3} a+(c2) a+(a0) a+(a1) a-(v0) a-(c1) a-(c0)