// Simple LTS from Lec 9 of Computer-Aided Verification

module M

s:[0..3];

[] s=0 -> (s'=1);
[] s=0 -> (s'=2);
[] s=1 -> (s'=1);
[] s=1 -> (s'=3);
[] s=2 -> (s'=1);
[] s=3 -> (s'=3);

endmodule

label "a" = s=0 | s=1;
label "b" = s=0 | s=3;