Ciao Preprocessor (integrated Alpha version)
 | This is an alpha distribution, meant only for testing. Please do let us 
 | know at ciaopp-bugclip.dia.fi.upm.es any problems you may have.

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{written file /tmp/tmpSmONT4/duplicate_eterms_shfr_nfg_resources_co.pl}
:- module(_1,[duplicate/2],[assertions,predefres(res_steps),nativeprops,basicmodes,regtypes]).

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

:- true pred duplicate(A,B)
         : ( gnd(A), term(B) )
        => ( list(A,gnd), rt8(B) ).

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

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

:- true pred duplicate(A,B)
         : ( gnd(A), term(B) )
        => ( list(A,gnd), rt8(B), size(lb,A,length(A)), size(lb,B,2*length(A)) )
         + cost(lb,steps,0).

:- true pred duplicate(A,B)
         : ( gnd(A), term(B) )
        => ( list(A,gnd), rt8(B), size(ub,A,length(A)), size(ub,B,2*length(A)) )
         + cost(ub,steps,length(A)+1).

duplicate([],[]).
duplicate([X|Y],[X,X|Z]) :-
        duplicate(Y,Z).


:- regtype rt8/1.

rt8([]).
rt8([A,B|C]) :-
        gnd(A),
        gnd(B),
        rt8(C).