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  1. or download this
    #! perl
use strict;
...
20 30 40
60 70 80
90 100 49
  2. or download this
    23:50 >perl 548_SoPW.pl
([20, 30, 40], [60, 70, 80], [90, 100, 49])
element at col 3, row 2 is 80

23:50 >
  3. or download this
    my   @matrix;
push @matrix, [ split ] while <DATA>;