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Fixed a bug where fresh variables were mistakenly treated like regular variables when making sure that variables either show up in the role's input, or has already been seen in a received message.

Fixed a very subtle bug that sometimes occasionally caused multiple statements to be grouped into a single statement, resulting in nonsensical error messages despite having a well-formed theory.

Initial commit to the public repository. Contains all the files needed to run Maude-PSL, as well as an examples directory, and a directory of the original npa-examples for use of comparisions with the Maude-PSL examples. Also contains a pdf file containing a description of the language.