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九九の表示 (Nested Flatten)

Factor です。

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USING: kernel sequences math math.parser io ;

: out ( x y -- )
  over number>string write
  " * " write
  dup number>string write
  " = " write
  * number>string 2 CHAR: \s pad-left write nl ;

9 [ 1+ 9 [ dupd 1+ out ] each drop ] each

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