-1/2 a^{a0,a1}_{c0,c3} b^{c3,a2}_{c1,a4} c^{a3,a5}_{c2,v0} gamma1^{a4}_{a5} a+(c0) a+(c1) a+(c2) a+(v0) a-(a3) a-(a2) a-(a1) a-(a0)
-1/2 a^{a0,a4}_{c0,c3} b^{c3,a1}_{c1,a5} c^{a2,a3}_{c2,v0} eta1^{a5}_{a4} a+(c0) a+(c1) a+(c2) a+(v0) a-(a3) a-(a2) a-(a1) a-(a0)