... systems.^1.1

Remarkably, a software package called CYGWIN32, recently released by the GNU project, provides enough Unix-like functionality, so that SU may be ported to Windows NT, with no changes to the SU source code or Makefiles!

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... return.^2.1

The phrase ``carriage return'' refers to an older technology, the typewriter. Ask your parents (or grandparents) for further details.

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... up.^3.1

This issue came up originally, when a student had destroyed an original dataset, by accident, but only had a bit-mapped PostScript image of the data. Using h2b it was possible to recover the data from the PostScript file.

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