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{(,⍺∘.⍺[↑,⊢)⍣(⍵-1)⊢⍺⍳⍵⍴≢⍺]}
Try it online!Try it online!
-6 bytes thanks to @ngn !
{(,⍺∘.,⊢)⍣(⍵-1)⊢⍺}
Try it online!
{⍺[↑,⍳⍵⍴≢⍺]}
