1/2 a^{v0}_{c0} b^{c0}_{a1} c^{a0,a2}_{v1,v2} gamma1^{a1}_{a2} a+(v1) a+(v2) a-(v0) a-(a0)
+1/2 a^{v1}_{c0} b^{c0}_{a0} c^{a1,a2}_{v0,v1} a+(a0) a+(v0) a-(a2) a-(a1)
-a^{v1}_{c0} b^{c0}_{a1} c^{a0,a2}_{v0,v1} gamma1^{a1}_{a2} a+(v0) a-(a0)
-a^{v1}_{c0} b^{c1}_{a1} c^{a0,a2}_{v0,v1} gamma1^{a1}_{a2} a+(c0) a+(v0) a-(a0) a-(c1)