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