-1/8 a^{v0,v1}_{c0,c1} b^{c2}_{a0} c^{a2,a3}_{c3,a1} lambda2^{a0,a1}_{a2,a3} a+(c0) a+(c1) a+(c3) a-(v1) a-(v0) a-(c2)
+1/4 a^{v0,v1}_{c0,c2} b^{c2}_{a0} c^{a2,a3}_{c1,a1} lambda2^{a0,a1}_{a2,a3} a+(c0) a+(c1) a-(v1) a-(v0)
-1/2 a^{v0,v1}_{c0,c2} b^{c2}_{a2} c^{a1,a3}_{c1,a0} gamma1^{a2}_{a3} a+(c0) a+(c1) a+(a0) a-(v1) a-(v0) a-(a1)