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 for gzip
From The Free On-line Dictionary of Computing (30 December 2018) :

      GNU compression utility.  Gzip reduces
     the size of the named files using Lempel-Ziv LZ77
     compression.  Whenever possible, each file is replaced by one
     with the filename extension ".gz".  Compressed files can be
     restored to their original form using gzip -d or gunzip or
     The Unix "{compress" utility is patented (by two separate
     patents, in fact) and is thus shunned by the GNU Project since
     it is not free software.  They have therefore chosen gzip,
     which is free of any known software patents and which tends
     to compress better anyway.  All compressed files in the GNU
     anonymous FTP area (gnu.org/pub/gnu) are in gzip
     format and their names end in ".gz" (as opposed to
     "compress"-compressed files, which end in ".Z").
     Gzip can uncompress "compress"-compressed files and "pack"
     files (which end in ".z").  The decompression algorithms are
     not patented, only compression is.
     The gzip program is available from any GNU archive site in
     shar, tar, or gzipped tar format (for those who already
     have a prior version of gzip and want faster data
     transmission).  It works on virtually every Unix system,
     MS-DOS, OS/2 and VMS.

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