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