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open FILE, $filename or die "Can't open $filename\n";
my @lines = <FILE>;
close FILE;
my @new_list = keys map {$_ => 1} @lines;

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"'