Re: how to make this fail driven loop succesfull ?

Kilian Evang <[email protected]>
Newsgroups gmane.comp.ai.prolog.swi
Message-ID <[email protected]> 
On 2014-03-08 22:00, Roelof Wobben wrote:
> I have tried to add siblings(_) but with no success 

You need siblings(_,_). In Prolog, a predicate is identified by functor
*and* number of arguments. siblings with 1 argument (referred to as
siblings/1) is completely different from siblings with 2 arguments
(referred to as siblings/2).
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