a^{a1}_{c0} b^{c1,a0}_{c4,a2} c^{c3,c4}_{c2,v0} eta1^{a2}_{a1} a+(c0) a+(c2) a+(v0) a-(a0) a-(c3) a-(c1)
+a^{a0}_{c2} b^{c0,a2}_{c3,a1} c^{c2,c3}_{c1,v0} a+(c1) a+(a1) a+(v0) a-(a2) a-(a0) a-(c0)
-a^{a0}_{c2} b^{c2,a2}_{c3,a1} c^{c1,c3}_{c0,v0} a+(c0) a+(a1) a+(v0) a-(a2) a-(a0) a-(c1)
-a^{a1}_{c2} b^{c0,a0}_{c3,a2} c^{c2,c3}_{c1,v0} eta1^{a2}_{a1} a+(c1) a+(v0) a-(a0) a-(c0)
+a^{a1}_{c2} b^{c2,a0}_{c3,a2} c^{c1,c3}_{c0,v0} eta1^{a2}_{a1} a+(c0) a+(v0) a-(a0) a-(c1)
-a^{a1}_{c4} b^{c1,a0}_{c0,a2} c^{c3,c4}_{c2,v0} eta1^{a2}_{a1} a+(c0) a+(c2) a+(v0) a-(a0) a-(c3) a-(c1)
-1/2 a^{a1}_{c4} b^{c4,a0}_{c0,a2} c^{c2,c3}_{c1,v0} eta1^{a2}_{a1} a+(c0) a+(c1) a+(v0) a-(a0) a-(c3) a-(c2)