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