Boxed Arrays                  B1

   a =. i. 5
   a
0 1 2 3 4
   b =. 'Cogito, ergo sum!'             NB. Descartes
   b
Cogito, ergo sum!
   <a
+---------+
|0 1 2 3 4|
+---------+
   <b
+-----------------+
|Cogito, ergo sum!|
+-----------------+

   aa =. < a
   aa , < b
+---------+-----------------+
|0 1 2 3 4|Cogito, ergo sum!|
+---------+-----------------+
