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