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# This example Tamsin program was written by Chris Pressey, and is
# hereby placed in the public domain.  It comes with NO WARRANTY.

main = (expr0 & eof & 'ok').
expr0 = expr1 & {"+" & expr1}.
expr1 = term & {"*" & term}.
term = "x" | "y" | "z" | "(" & expr0 & ")".