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+The <tt>ddb</tt> directory holds routines used to debug the kernel.
+The 4.3BSD Internals book by Leffler, McKusick, Karels and Quarterman
+doesn't really cover this directory. However, some information has been
+presented by Kirk KcKusick and Keith Bostic in their "UNIX Kernel Internals"
+notes, which they have presented in many places in the past few years.
+<p>