RosettaCodeData/Task/Range-extraction/TXR/range-extraction.txr

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(defun range-extract (numbers)
`@{(mapcar [iff [callf > length (ret 2)]
(ret `@[@1 0]-@[@1 -1]`)
(ret `@{@1 ","}`)]
(mapcar (op mapcar car)
(split [window-map 1 :reflect
(op list @2 (- @2 @1))
(sort (uniq numbers))]
(op where [chain second (op < 1)])))) ","}`)