Monadic Epsilon Underbar is not defined

Dyadic Epsilon Underbar means

Find

      'ana' ⍷ 'Banana'
0 1 0 1 0 0

      X Y
┌───┬───────┐
│0 1│0 1 0 0│
│1 0│1 0 0 1│
│   │0 0 1 0│
│   │0 1 0 0│
└───┴───────┘
      
      X ⍷ Y
1 0 0 0
0 0 1 0
0 1 0 0
0 0 0 0

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