Reversible sound change applier

Everyone's enchanted with Henrik's schcompile right now (myself included), I
know; but perhaps there's room for another sound change applier?

With this hope I introduce rsca, a reversible sound change applier:
  http://members.shaw.ca/a00/rsca.html

I came up with the design for rsca in late February, but the demands of the
school term meant I couldn't start seriously coding until a week or two ago,
and now here it is.  Some features are:
 - it can run sound changes backward, reconstructing earlier forms of words,
as well as forwards (which as far as I know no other sound change applier does);
 - it is fairly general in terms of the sound changes expressible;
 - it can understand X-SAMPA and (largely) CXS.


Alex

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