pnm2ppa: pnm2ppa (Ghostscript print filter for HP printers)
pnm2ppa:
pnm2ppa: Ghostscript print filter for owners of HP DeskJet 710C, 712C, 720C,
pnm2ppa: 722C, 820Cse, 820Cxi, 1000Cse, or 1000Cxi printers.
pnm2ppa: 
pnm2ppa: Homepage: http://pnm2ppa.sourceforge.net/
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