1/4 a^{a2,v0}_{a0,a1} b^{c0}_{v0} c^{c3,a3}_{c1,c2} lambda2^{a0,a1}_{a2,a3} a+(c1) a+(c2) a-(c3) a-(c0)
-1/4 a^{a2,v0}_{a0,a1} b^{c0}_{v1} c^{c3,a3}_{c1,c2} lambda2^{a0,a1}_{a2,a3} a+(c1) a+(c2) a+(v1) a-(v0) a-(c3) a-(c0)
+1/2 a^{a1,v0}_{a0,a2} b^{c0}_{v0} c^{c3,a3}_{c1,c2} gamma1^{a2}_{a3} a+(c1) a+(c2) a+(a0) a-(a1) a-(c3) a-(c0)