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 Level At u L: n  _ _ _

 The conjunction L: applies the verb u at the levels specified by n . The right argument n behaves like that of the rank conjunction in several respects: It may have three elements, specifying levels for the monadic, left, and right cases The full form of the levels used is 3\$&.|.n . For example, a 2-element list p,q is equivalent to q,p,q . Negative values are complementary: u L:(-r) y ↔ u L:(0>.(L.y)-r) y

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

+: L: 0 y                   The adverb L:0 may be called leaf
+-------+----------------+
|+-----+|+-----+--------+|
||4 6 8|||10 12|+------+||
|+-----+||     ||0 2  4|||
|       ||     ||6 8 10|||
|       ||     |+------+||
|       |+-----+--------+|
+-------+----------------+

2 # L: 0 y
+-------------+-----------------+
|+-----------+|+-------+-------+|
||2 2 3 3 4 4|||5 5 6 6|+-----+||
|+-----------+||       ||0 1 2|||
|             ||       ||0 1 2|||
|             ||       ||3 4 5|||
|             ||       ||3 4 5|||
|             ||       |+-----+||
|             |+-------+-------+|
+-------------+-----------------+

2 # L: 1 y
+-------------+-----------------------+
|+-----+-----+|+-------+-------------+|
||2 3 4|2 3 4|||5 5 6 6|+-----+-----+||
|+-----+-----+||       ||0 1 2|0 1 2|||
|             ||       ||3 4 5|3 4 5|||
|             ||       |+-----+-----+||
|             |+-------+-------------+|
+-------------+-----------------------+
```

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