Here is a complicated regexp, stored in @code{sentence-end} and used
by Emacs to recognize the end of a sentence together with any
-whitespace that follows. We show it Lisp syntax to distinguish the
+whitespace that follows. We show its Lisp syntax to distinguish the
spaces from the tab characters. In Lisp syntax, the string constant
begins and ends with a double-quote. @samp{\"} stands for a
double-quote as part of the regexp, @samp{\\} for a backslash as part