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Level Of L.  _

If y is open or empty, L. y is 0; if it is boxed and non-empty, the level is one plus the maximum of the levels of the opened elements.
 
 
 

For example:
   ]y=: (<<2 3 4),<(5 6 ; <<i. 2 3)
+-------+-------------+
|+-----+|+---+-------+|
||2 3 4|||5 6|+-----+||
|+-----+||   ||0 1 2|||
|       ||   ||3 4 5|||
|       ||   |+-----+||
|       |+---+-------+|
+-------+-------------+

   L. y
3

   L."0 y
2 3



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