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Line 1,697: A numeric approach, based on a discussion in the J forums (primarily [http://jsoftware.com/pipermail/programming/2015-June/042139.html Pascal Jasmin] and [http://jsoftware.com/pipermail/programming/2015-June/042141.html Marshall Lochbaum]): <lang j> torle =: (#, {.);.1~ 1,2&( ~:/\) ] frle=: #/@:\|:</lang>

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