-a^{a0,a1}_{c0,c4} b^{c1}_{v0} c^{c3,c4}_{c2,a2} eta1^{a2}_{a1} a+(c0) a+(c2) a+(v0) a-(a0) a-(c3) a-(c1)
-1/2 a^{a0,a1}_{c0,c4} b^{c4}_{v0} c^{c2,c3}_{c1,a2} eta1^{a2}_{a1} a+(c0) a+(c1) a+(v0) a-(a0) a-(c3) a-(c2)
+1/4 a^{a0,a1}_{c2,c3} b^{c0}_{v0} c^{c2,c3}_{c1,a2} a+(c1) a+(a2) a+(v0) a-(a1) a-(a0) a-(c0)
+1/2 a^{a0,a1}_{c2,c3} b^{c0}_{v0} c^{c2,c3}_{c1,a2} eta1^{a2}_{a1} a+(c1) a+(v0) a-(a0) a-(c0)
-1/2 a^{a0,a1}_{c2,c3} b^{c2}_{v0} c^{c1,c3}_{c0,a2} a+(c0) a+(a2) a+(v0) a-(a1) a-(a0) a-(c1)
-a^{a0,a1}_{c2,c3} b^{c2}_{v0} c^{c1,c3}_{c0,a2} eta1^{a2}_{a1} a+(c0) a+(v0) a-(a0) a-(c1)