1/2 a^{c0,c1}_{a0,v0} b^{a1}_{c4} c^{c3,c4}_{c2,a2} eta1^{a2}_{a1} a+(c2) a+(a0) a+(v0) a-(c3) a-(c1) a-(c0)
+1/2 a^{c0,c1}_{a1,v0} b^{a2}_{c4} c^{c3,c4}_{c2,a0} gamma1^{a1}_{a2} a+(c2) a+(a0) a+(v0) a-(c3) a-(c1) a-(c0)