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