% 商品データ
product(item1,3000,4.8,20).
product(item2,1800,4.2,200).
product(item3,5000,4.9,5).
product(item4,2500,4.5,80).
 
% 評価4.5以上
high_rating(Item) :-
    product(Item, _, Rating, _),
    Rating >= 4.5.
 
% 価格3000円以下
affordable(Item) :-
    product(Item, Price, _, _),
    Price =< 3000.
 
% レビュー50件以上
popular(Item) :-
    product(Item, _, _, Reviews),
    Reviews >= 50.
 
% おすすめ商品
recommended(Item) :-
    high_rating(Item),
    affordable(Item),
    popular(Item).

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