Prolog add to list if element is not equal to string -

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i trying create list of pairs have non-null guard element.

get_only_guarded(l) :-     guard \= null,     findall([s,d],transition(s,d,_,guard,_),l).

this ive tried doesnt seem work. correct way?

use dif(guard,null) instead. handle (\=)/2 care!


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