Equal Underbar ≡
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