facilities.
@item Extensible Streams
-@code{sb-gray} is an implentation of @emph{Gray Streams}. @xref{Gray
+@code{sb-gray} is an implementation of @emph{Gray Streams}. @xref{Gray
Streams}.
@code{sb-simple-streams} is an implementation of the @emph{simple
@item Executable Fasl Packaging
@code{sb-executable} can be used to concatenate multiple fasls into a
-single executable (though the presense of an SBCL runtime and core image
+single executable (though the presence of an SBCL runtime and core image
is still required to run it).
The @code{:executable} argument to @ref{Function
@item Bitwise Rotation
@code{sb-rotate-byte} provides an efficient primitive for bitwise
rotation of integers, an operation required by eg. numerous
-cryptographic algorightms, but not available as a primitive in ANSI
+cryptographic algorithms, but not available as a primitive in ANSI
Common Lisp. @xref{sb-rotate-byte}.
@item Test Harness
@subsection Internals Documentation
If you're interested in the development of the SBCL system itself,
-then subcribing to @cite{sbcl-devel} is a good idea.
+then subscribing to @cite{sbcl-devel} is a good idea.
SBCL internals documentation -- besides comments in the source -- is
-currenly maitained as a @emph{wiki-like} website:
+currently maintained as a @emph{wiki-like} website:
@uref{http://sbcl-internals.cliki.net/}.
Some low-level information describing the programming details of the