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