1/8 a^{v0,v1}_{c0,c1} b^{c0,c1}_{a0,a1} c^{a3}_{a2} a+(a0) a+(a1) a+(a2) a-(v1) a-(v0) a-(a3)
-1/4 a^{v0,v1}_{c0,c1} b^{c0,c1}_{a0,a2} c^{a3}_{a1} gamma1^{a2}_{a3} a+(a0) a+(a1) a-(v1) a-(v0)
-1/2 a^{v0,v1}_{c0,c2} b^{c1,c2}_{a0,a2} c^{a3}_{a1} gamma1^{a2}_{a3} a+(c0) a+(a0) a+(a1) a-(v1) a-(v0) a-(c1)