-a^{a1,v0}_{c0,a0} b^{c1,v1}_{c3,a2} c^{c3}_{c2} eta1^{a2}_{a1} a+(c0) a+(c2) a+(a0) a-(v1) a-(v0) a-(c1)
+a^{a1,v0}_{c1,a0} b^{c1,v1}_{c2,a2} c^{c2}_{c0} a+(c0) a+(a0) a+(a2) a-(v1) a-(v0) a-(a1)
-a^{a1,v0}_{c1,a0} b^{c1,v1}_{c2,a2} c^{c2}_{c0} eta1^{a2}_{a1} a+(c0) a+(a0) a-(v1) a-(v0)
+a^{a1,v0}_{c3,a0} b^{c1,v1}_{c0,a2} c^{c3}_{c2} eta1^{a2}_{a1} a+(c0) a+(c2) a+(a0) a-(v1) a-(v0) a-(c1)
-a^{a1,v0}_{c3,a0} b^{c3,v1}_{c0,a2} c^{c2}_{c1} eta1^{a2}_{a1} a+(c0) a+(c1) a+(a0) a-(v1) a-(v0) a-(c2)