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#!/usr/bin/perl
use strict;
...
42 is between 40 and 100
99 is between 40 and 100
111 is not between 40 and 100

#!/usr/bin/perl
use strict;
...
[42 99] is within [40 100]
[83 120] is not within [40 100]
[101 111] is not within [40 100]