a^{v1}_{a0} b^{a1}_{v1} c^{v0}_{a2} eta1^{a2}_{a1} a+(a0) a-(v0)
+a^{v1}_{a1} b^{a2}_{v1} c^{v0}_{a0} gamma1^{a1}_{a2} a+(a0) a-(v0)