Twin primes by nn

:cm L let 
:Ln=1|wh n<1997|Lb=n|Ln+=2|wh n*(n+2)%b|Lb-=2|endw|let@O=b>1?"":n.",".(n+2)."\n"|endw
"oPZZ

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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