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my %newhash;
@newhash{@array} = @oldhash{@array};

my %new = map { $_=> $old{$_} } grep { defined $old{$_} } @array;

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"'