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