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Monadic Equal Underbar means

Depth

      ≡ 7
0
      ≡ 'abc'
1
      ≡ (1 2)(3 4)
2
      ≡ (1 2)(3 4)5
¯2

Note: Result is always positive if ⎕ML is greater than or equal to 2

Dyadic Equal Underbar means

Match

      'b' 'e' 'x' ≡ 'bex'
1
      1 ≡ 1 1
0

Language Elements