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RosettaCodeData/Task/Range-extraction/J/range-extraction-1.j

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fmt=: [: ;@(8!:0) [`]`({. ; (',-' {~ 2 < #) ; {:)@.(2 <. #)
group=: <@fmt;.1~ 1 ~: 0 , 2 -~/\ ]
extractRange=: ',' joinstring group
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