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