Multiple binaries often have have the same manpage, especially if the two
programs are identical except for name, or do the oposite of each other.
Examples (based on a cygwin system, so these might not hold true in debian):
gunzip, gzip, and zcat
bzip2, bunzip2, bzcat and bz2recover
grep, egrep, and fgrep
bzgrep, bzegrep, bzfgrep