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  1. or download this
    echo 1st rule: 2nd, 3rd and 4th floor must be free in 5 min. Not in 6.
+ Call 911 for emergencies   |

...

first rule: second, third and fourth floor must be free in five min. N
+ot in six. Call nine hundred and eleven for emergencies
  2. or download this
    perl -MO=Deparse  -pne "s/(\d+)([st|nd|rd|th])+/num2en_ordinal($1)/ge;
+s/(\d+)/num2en($1)/ge"

...
}
-e syntax OK
  3. or download this
     
s/(\d+)(st|nd|rd|th)/num2en_ordinal($1)/ge