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