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  1. or download this
    $ cat num
Hello 12345
world 23456
777381 89651
  2. or download this
    $ perl -lpne 's/\d/qw(zero one two three four five six seven eight nin
+e)[$&]/ge' num
  3. or download this
    $ perl -lpe 's/\d/qw(zero one two three four five six seven eight nine
+)[$&]/ge'