print "$_<BR>" for sort @INC;
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Note: The paths listed in @INC are searched left-to-right, so it might be a good idea to leave it unsorted if you're using the output to analyze a problem with your code.

It just occurred to me that I may have misunderstood your request. If you'd like to print both keys and values from %INC (%INC and @INC are two distinct variables), you could use:

print "$_: $INC{$_}<BR>" for sort keys %INC;
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