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Jul 4 at 17:07 comment added Adám Silly me. (r↑i/i←2*⍳r←⍴s)⊆s←⎕ or s⊂⍨r↑i/i←×⍨⍳r←⍴s←⎕ with ⎕IO←0
Jul 4 at 12:25 comment added Graham @Adám. Thanks but your first suggestion results in segments of linear increasing length: a bc def ghij klmno in APL+WIN
Jul 4 at 9:02 comment added Adám Using ⎕IO←1: (r↑i/i←⍳r←⍴s)⊂s←⎕ (or s⊂⍨r↑i/i←⍳r←⍴s←⎕ if you upgrade.)
Jul 3 at 6:28 history answered Graham CC BY-SA 4.0