-1/2 a^{c0,c1}_{c3,a0} b^{a2}_{v0} c^{c2,c3}_{a1,a3} eta1^{a3}_{a2} a+(a0) a+(a1) a+(v0) a-(c2) a-(c1) a-(c0)
+1/4 a^{c0,c1}_{c3,a2} b^{a3}_{v0} c^{c2,c3}_{a0,a1} gamma1^{a2}_{a3} a+(a0) a+(a1) a+(v0) a-(c2) a-(c1) a-(c0)