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       ppmtopcx - convert a portable pixmap into a PCX file
       ppmtopcx [ppmfile]
       Reads a portable pixmap as input.  Produces a PCX file as output.
       pcxtoppm(1), ppm(5)
       Copyright (C) 1990 by Michael Davidson.
                                 09 April 1990                     ppmtopcx(1)