a^{c1,a0}_{c0,v0} b^{a2}_{a1} c^{v1}_{a3} eta1^{a3}_{a2} eta1^{a1}_{a0} a+(c0) a+(v0) a-(v1) a-(c1)
+a^{c1,a0}_{c0,v0} b^{a2}_{a1} c^{v1}_{a3} lambda2^{a1,a3}_{a0,a2} a+(c0) a+(v0) a-(v1) a-(c1)