This is a Morbit cipher, described
here in "The ACA and You". It's a little bit longer than the
ACA standard.
The Morbit cipher seems to be quite a bit like the Fractionated
Morse cipher, found in
Frac and also
Fractionated Morse.
If you've got yourself a solver for a FracMo, I say, "Morph-it
to a Morbit!"
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