a^{a0}_{c0} b^{c0}_{c1} c^{c1,a2}_{a1,v0} a+(a1) a+(v0) a-(a2) a-(a0)
-a^{a1}_{c0} b^{c0}_{c1} c^{c1,a0}_{a2,v0} eta1^{a2}_{a1} a+(v0) a-(a0)
-a^{a1}_{c0} b^{c1}_{c2} c^{c2,a0}_{a2,v0} eta1^{a2}_{a1} a+(c0) a+(v0) a-(a0) a-(c1)
+a^{a1}_{c2} b^{c1}_{c0} c^{c2,a0}_{a2,v0} eta1^{a2}_{a1} a+(c0) a+(v0) a-(a0) a-(c1)
-a^{a1}_{c2} b^{c2}_{c0} c^{c1,a0}_{a2,v0} eta1^{a2}_{a1} a+(c0) a+(v0) a-(a0) a-(c1)