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Monadic Left Shoe means

Enclose

      1(2 3)
┌─┬───┐
│1│2 3│
└─┴───┘
      ⊂ 1(2 3)
┌───────┐
│┌─┬───┐│
││1│2 3││
│└─┴───┘│
└───────┘
      ⊂⊂ 1(2 3)
┌─────────┐
│┌───────┐│
││┌─┬───┐││
│││1│2 3│││
││└─┴───┘││
│└───────┘│
└─────────┘

Dyadic Left Shoe means

If ⎕ML<3Partitioned Enclose

       0 1 0 1 ⊂ 1 2 3 4
┌───┬─┐
│2 3│4│
└───┴─┘

If ⎕ML≥3Partition

      0 1 0 1 ⊂ 1 2 3 4
┌─┬─┐
│2│4│
└─┴─┘

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