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