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  1. or download this
    my %chicago;   @chicago{   qw( tiger bob munch toy  ) } = ();
my %wisconsin; @wisconsin{ qw( tiger sara munch toy ) } = ();
my %rockford;  @rockford{  qw( tiger sara love toy  ) } = ();
  2. or download this
    my %chicago   = map { $_ => undef } qw( tiger bob munch toy  );
my %wisconsin = map { $_ => undef } qw( tiger sara munch toy );
my %rockford  = map { $_ => undef } qw( tiger sara love toy  );
  3. or download this
    my %chicago   = map { $_ => 1 } qw( tiger bob munch toy  );
my %wisconsin = map { $_ => 1 } qw( tiger sara munch toy );
my %rockford  = map { $_ => 1 } qw( tiger sara love toy  );