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Perlで2つの配列の要素から重複を排除する、重複した要素だけ抽出する ref: http://qiita.com/mugyuu/items/f5d825c5214a7848305a
hoge# perl make_array_unique .pl
6
2
8
4
10
@unique = grep { $count{$_} >= 2 } keys %count; # 要素数が2より小さいもののみ抽出
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