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Comment NB.

The rest of the line following NB. is ignored.
 

For example:
   text=: 'i. 3 4 NB. 3-by-4 table'
   ;: text
+--+---+----------------+
|i.|3 4|NB. 3-by-4 table|
+--+---+----------------+

   ". text                     NB. Execute text
0 1  2  3
4 5  6  7
8 9 10 12
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