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use strict;
use warnings;
...
# print scalar num2range( 1,2,2.5,3.5,4.5,7,6,-5,-6,-7,7,8,9,10,0,12,4
+2-24 );
# Gives:
# -7--5,0-2,2.5-4.5,4.6,6-10,12,18