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