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