The \hyphenation command declares allowed hyphenation points, where
words is a list of words, separated by spaces, in which each
hyphenation point is indicated by a - character. For example
\hyphenation{fortran,er-go-no-mic}
indicates that "fortran" cannot be hyphenated and indicates allowed
hyphenation points for "ergonomic".
This argument to this command should contain words composed only of normal
letters. To suggest hyphenation points for strings containing nonletters
or accented letters, use
the \- command in the input text.