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