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>perl -wMstrict -le
"my @ranges = ('15', '28-31', '3-4', '40', '17-19');
...
 print qq{total between $total_min and $total_max};
"
total between 103 and 109

perl -wMstrict -le
"my @ranges = qw(15 28-31 3-4 40 17-19  99- -99 -99- x x-x);
...
 print qq{total between $total_min and $total_max};
"
total between 103 and 109