my @list = qw{ABCDE DEFGH}; # @list has two elements.
my @list = qq{ABCDE DEFGH}; # @list has one element.
my @list = q{ABCDE DEFGH};  # @list has one element.

##</code><code>##

my @list = qw{ABCDE DEFGH};      # Two elements.
my @list = ('ABCDE', 'DEFGH');   # Two elements.

##</code><code>##

my @list = ([qw{ABCDE DEFGH}], [qw{IJKLM NOPQR}]);  # Two array-refs with two elements in each.
my @list = (['ABCDE, 'DEFGH'], ['IJKLM', 'NOPQR']); # Two array-refs with two elements in each.

##</code><code>##

my @list = ('ABCDE', qw{DEFGH IJKLM}, 'NOPQR');  # Four elements.