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