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408 B

mdp
module one
x : [0 .. 2] init 0;
[a] x=0 -> (x'=1);
[] x>=0 -> (x'=2);
[done] x>=1 -> true;
endmodule
module two
y : [0 .. 2] init 0;
[b] y=0 -> (y'=1);
[] y>=0 -> (y'=2);
[done] y>=1 -> true;
endmodule
module three
z : [0 .. 2] init 0;
[a] z=0 -> (z'=1);
[] x=0&y=0&z=1 -> (z'=2);
[loop] z>=1 -> true;
endmodule
system
((one || two {b <- a}) / {a}) {done <- loop} || three
endsystem