1/2 a^{a0,v0}_{c0,c1} b^{v1}_{a1} c^{a3}_{a2} eta1^{a2}_{a0} gamma1^{a1}_{a3} a+(c0) a+(c1) a-(v1) a-(v0)
+1/2 a^{a0,v0}_{c0,c1} b^{v1}_{a1} c^{a3}_{a2} lambda2^{a1,a2}_{a0,a3} a+(c0) a+(c1) a-(v1) a-(v0)