-1/2 a^{a0}_{c1} b^{a1,a2}_{a3,v0} c^{c1,a4}_{c0,v1} gamma1^{a3}_{a4} a+(c0) a+(v0) a+(v1) a-(a2) a-(a1) a-(a0)
-1/2 a^{a3}_{c1} b^{a0,a1}_{a4,v0} c^{c1,a2}_{c0,v1} eta1^{a4}_{a3} a+(c0) a+(v0) a+(v1) a-(a2) a-(a1) a-(a0)