% 商品データ
% product(商品名, 価格, 評価, レビュー数).
 
product(item1, 3000, 4.8, 20).
product(item2, 1800, 4.2, 200).
product(item3, 5000, 4.9, 5).
product(item4, 2500, 4.5, 80).
 
% 価格が3000円以下の商品
cheap_product(Name, Price) :-
    product(Name, Price, _, _),
    Price =< 3000.
 
% 評価が4.5以上の商品
high_rating_product(Name, Rating) :-
    product(Name, _, Rating, _),
    Rating >= 4.5.
 
% レビュー数が50件以上の商品
popular_product(Name, Reviews) :-
    product(Name, _, _, Reviews),
    Reviews >= 50.
 
% 評価が高く、レビュー数も多いおすすめ商品
recommended_product(Name) :-
    product(Name, _, Rating, Reviews),
    Rating >= 4.5,
    Reviews >= 50.
 
    ?- cheap_product(Name, Price).
``

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