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