Annotated using CiaoPP:
:- mode(less/2, [-,+]).
:- measure(less/2, [size,size]).
%complexity: less(o,i).
%% less(X, Y) :- X, Y are numerals such that X lt Y.
%%


%TWTYPES     :- type less(nat,nat).

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



/*TWDESC

less(X, Y) :- X, Y are numerals such that X lt Y.

*/


/*TWTYPES

nat(0).
nat(s(X)) :- nat(X).

*/


/*TWDEMO

selected_norms([nat]).

query(less(b,f)).
query(less(f,b)).

*/


Caslog 1.0, April 1992.

* Mutually exclusive classes of clauses for predicate less/2 :

[[1,2]]

* Size functions for predicate less/2 :

[$(2)+1,$(2)]

* Relation functions for predicate less/2 :

[inf]

* Solution functions for predicate less/2 :

[$(2)]

* Time functions for predicate less/2 :

[2* $(2)]

{Exexution Time: 4.0 msec}

{End of Caslog execution.}