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