=head1 REFERENCES
X<reference> X<dereference> X<dereferencing> X<pointer>
-The most important thing to understand about all data structures in Perl
--- including multidimensional arrays--is that even though they might
+The most important thing to understand about all data structures in
+Perl--including multidimensional arrays--is that even though they might
appear otherwise, Perl C<@ARRAY>s and C<%HASH>es are all internally
one-dimensional. They can hold only scalar values (meaning a string,
number, or a reference). They cannot directly contain other arrays or
}
=head1 HASHES OF HASHES
-X<hass of hashes> X<HoH>
+X<hash of hashes> X<HoH>
=head2 Declaration of a HASH OF HASHES