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Iota Underbar ⍸

Monadic Iota Underbar means

Where 

      ⍸ 1 0 0 1 1
1 4 5
      bmat
0 1 0
1 0 1
      ⍸ bmat
┌───┬───┬───┐
│1 2│2 1│2 3│
└───┴───┴───┘

Dyadic Iota Underbar means

Interval Index 

      'AEIOU' ⍸ 'DYALOG'
1 5 1 3 4 2

      2 4 6 ⍸ 1 2 3 4 5 6 7
0 1 1 2 2 3 3

      mat
1 2
3 4
5 6
      mat ⍸ 3 3
1
      mat ⍸ 3 5
2

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