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