Ciao Preprocessor (integrated Alpha version)
 | This is an alpha distribution, meant only for testing. Please do let us 
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{written file /tmp/tmpdDG9Hf/less-fb_eterms_shfr_nfg_steps_ualb_co.pl}
:- module(_1,[less/2],[assertions,regtypes,nativeprops]).

:- entry less(A,B)
         : ground(B).

:- true pred less(A,B)
         : ( term(A), gnd(B) )
        => ( rt6(A), rt8(B) ).

:- true pred less(A,B)
         : ( native_props:mshare([[A]]), ground([B]) )
        => ground([A,B]).

:- true pred less(A,B)
         : ( term(A), gnd(B) )
        => ( rt6(A), rt8(B) )
         + ( possibly_fails, not_covered ).

:- true pred less(A,B)
         : ( term(A), gnd(B) )
        => ( rt6(A), rt8(B), size_lb(A,size(B)), size_lb(B,size(B)), size_ub(A,size(B)+1), size_ub(B,size(B)) )
         + ( steps_lb(0), steps_ub(2*size(B)) ).

less(0,s(_1)).
less(s(X),s(Y)) :-
        less(X,Y).


:- regtype rt6/1.

rt6(0).
rt6(s(A)) :-
        rt6(A).


:- regtype rt9/1.

rt9(A) :-
        gnd(A).


:- regtype rt8/1.

rt8(s(A)) :-
        rt9(A).