1/2 a^{v1,v2}_{a0,v0} b^{c1,a2}_{c0,a1} c^{a3}_{c2} gamma1^{a1}_{a3} gamma1^{a0}_{a2} a+(c0) a+(c2) a+(v0) a-(v2) a-(v1) a-(c1)
+1/2 a^{v1,v2}_{a0,v0} b^{c1,a2}_{c0,a1} c^{a3}_{c2} lambda2^{a0,a1}_{a2,a3} a+(c0) a+(c2) a+(v0) a-(v2) a-(v1) a-(c1)