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f←{÷/1 1 cmpx '⍋x' '{⍵[⍋⍵]}x' ⊣ x←⍵[?1e6⍴≢⍵]}

x←(?¨100⍴¨120 32000 2e9 0), (⎕d,⎕a) (⎕av)
y←f¨x

(¯1↑¨x) ,⍪ y