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Link: http://codepad.org/PoIHLzxE    [ raw code | output | fork ]

PHP, pasted on May 20:
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<?php
    for($i = 0; $i < 2; $i++)
    for($j = 0; $j < 2; $j++)
    for($k = 0; $k < 2; $k++)
    for($l = 0; $l < 2; $l++)
    echo chr($i+65).chr($j+65).chr($k+65).chr($l+65)."\n";
?>


Output:
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AAAA
AAAB
AABA
AABB
ABAA
ABAB
ABBA
ABBB
BAAA
BAAB
BABA
BABB
BBAA
BBAB
BBBA
BBBB


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