-1/2 a^{a1,a2}_{c0,a0} b^{v1,v2}_{c1,v0} c^{c1}_{a3} eta1^{a3}_{a2} a+(c0) a+(a0) a+(v0) a-(v2) a-(v1) a-(a1)
-1/4 a^{a1,a2}_{c0,a0} b^{v1,v2}_{c1,v0} c^{c1}_{a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(v0) a-(v2) a-(v1)
+1/4 a^{a1,a2}_{c0,a0} b^{v1,v2}_{c1,v0} c^{c2}_{a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(c1) a+(v0) a-(v2) a-(v1) a-(c2)
+1/2 a^{a1,a2}_{c1,a0} b^{v1,v2}_{c0,v0} c^{c1}_{a3} eta1^{a3}_{a2} a+(c0) a+(a0) a+(v0) a-(v2) a-(v1) a-(a1)
+1/4 a^{a1,a2}_{c1,a0} b^{v1,v2}_{c0,v0} c^{c1}_{a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(v0) a-(v2) a-(v1)