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9 changes: 4 additions & 5 deletions chapter-06/practical-session.pl
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Original file line number Diff line number Diff line change
Expand Up @@ -181,16 +181,15 @@
%% base case
accSet([],L,L).
%% inductive case
accSet([X|Inlist], AccList, Outlist) :-
not(member(X,AccList)),
accSet(Inlist,[X|AccList],Outlist).
accSet([X|Inlist], AccList, Outlist) :-
member(X,AccList),
accSet(Inlist,AccList,Outlist).
accSet([X|Inlist], AccList, Outlist) :-
accSet(Inlist,[X|AccList],Outlist).
%% main
set(Inlist,Outlist) :-
rev(TempOutlist, Outlist),
accSet(Inlist,[],TempOutlist).
accSet(Inlist,[],TempOutlist),
rev(TempOutlist, Outlist).

%% 3. We `flatten' a list by removing all the square brackets around any lists it
%% contains as elements, and around any lists that its elements contain as
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