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1 [] a!=0. 3 [] s(x)!=0. 6 [] ap(y,0)|ap(y,s(g(y)))| -ap(y,z). 9 [] -exists(lambda(x,ap(Z,x)))|ap(Z,e(Z)). 11 [] x+0=x. 12 [] x+s(y)=s(x+y). 13 [] (u<=v)=exists(lambda(x,u+x=v)). 14 [] a<=0. 16 [14,demod,13] exists(lambda(x,a+x=0)). 17 [binary,16.1,9.1,demod,beta] a+e(lambda(x,a+x=0))=0. 18 [binary,17.1,6.3,demod,beta,11,beta,12,unit_del,1,3] $F.