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sub populate_hash {
    my %hash;
    # populate hash
    \%hash;
}

my %top_level = % { populate_hash() };

perl -e 'print "How sweet does a rose smell? "; chomp ($n = <STDIN>); 
+$rose = "smells sweet to degree $n"; *other_name = *rose; print "$oth
+er_name\n"'