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