1/4 a^{a3,v0}_{c2,a0} b^{c0,c1}_{a1,a2} c^{c2}_{a4} eta1^{a4}_{a3} a+(a0) a+(a1) a+(a2) a-(v0) a-(c1) a-(c0)
-1/2 a^{a3,v0}_{c2,a0} b^{c0,c2}_{a1,a2} c^{c1}_{a4} eta1^{a4}_{a3} a+(a0) a+(a1) a+(a2) a-(v0) a-(c1) a-(c0)
-1/2 a^{a3,v0}_{c2,a0} b^{c0,c1}_{a1,a4} c^{c2}_{a2} eta1^{a4}_{a3} a+(a0) a+(a1) a+(a2) a-(v0) a-(c1) a-(c0)
+a^{a3,v0}_{c2,a0} b^{c0,c2}_{a1,a4} c^{c1}_{a2} eta1^{a4}_{a3} a+(a0) a+(a1) a+(a2) a-(v0) a-(c1) a-(c0)