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Haskellã§Stackãå®è£ ãã¾ããã åå ããäºå®ã ã£ãåå¿è Haskellåå¼·ä¼ç¬¬3å - [PARTAKE]ã®å®¿é¡ã«ãªã£ã¦ãããã¤ã§ãï¼çµå±ãããªãã£ãã®ã ãã©ï¼ data Stack a = Stack [a] deriving (Show) empty :: Stack a empty = Stack [] isEmpty :: Stack a -> Boâ¦