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5. Bordering a Table

   over=: ({.;}.)@":@,                  NB. Utility functions, intended for use
   by=:  ' '&;@,.@[,.]                  NB. rather than for immediate study

   primes=: 2 3 5
   i=: 0 1 2 3 4

   primes by i over primes */ i
+-+------------+
| |0 1  2  3  4|
+-+------------+
|2|0 2  4  6  8|
|3|0 3  6  9 12|
|5|0 5 10 15 20|
+-+------------+

   tba=: 1 : '[ by ] over x/'           NB. Table adverb

   primes * tba i
+-+------------+
| |0 1  2  3  4|
+-+------------+
|2|0 2  4  6  8|
|3|0 3  6  9 12|
|5|0 5 10 15 20|
+-+------------+
   7 11 ^ tba i
+--+-------------------+
|  |0  1   2    3     4|
+--+-------------------+
| 7|1  7  49  343  2401|
|11|1 11 121 1331 14641|
+--+-------------------+


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