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  1. or download this
    use warnings;
use strict;
...

print qq{one way '${ \STR }' and another '${ +STREF   }' \n};
print qq{and with another disambiguation '${  STREF() }' \n};
  2. or download this
    c:\@Work\Perl\monks>perl constant_interpolation_1.pl
one way 'a string' and another 'ref to a string'
and with another disambiguation 'ref to a string'