The ISO 8859 characters sets overlap, e.g. 8859-1 (Latin-1) and
8859-15 (Latin-9) differ only in a few characters. Emacs normally
distinguishes equivalent characters from those ISO-8859 character sets
-which are built in to Emacs. This behaviour is essentially inherited
+which are built in to Emacs. This behavior is essentially inherited
from the European-originated international standards. Treating them
equivalently, by translating to and from a single representation is
called `unification'. (The `utf-8' coding system treats the