-1/8 a^{a2,v0}_{a0,a1} b^{c0,c1}_{v1,v2} c^{a3}_{c2} lambda2^{a0,a1}_{a2,a3} a+(c2) a+(v1) a+(v2) a-(v0) a-(c1) a-(c0)
+1/4 a^{a2,v1}_{a0,a1} b^{c0,c1}_{v0,v1} c^{a3}_{c2} lambda2^{a0,a1}_{a2,a3} a+(c2) a+(v0) a-(c1) a-(c0)
-1/2 a^{a1,v1}_{a0,a2} b^{c0,c1}_{v0,v1} c^{a3}_{c2} gamma1^{a2}_{a3} a+(c2) a+(a0) a+(v0) a-(a1) a-(c1) a-(c0)