1/4 a^{a0}_{v0} b^{c0,c1}_{c4,a1} c^{c4,a2}_{c2,c3} gamma1^{a1}_{a2} a+(c2) a+(c3) a+(v0) a-(a0) a-(c1) a-(c0)
+1/4 a^{a1}_{v0} b^{c0,c1}_{c4,a2} c^{c4,a0}_{c2,c3} eta1^{a2}_{a1} a+(c2) a+(c3) a+(v0) a-(a0) a-(c1) a-(c0)