node count() returns (o : int)
let
  o = 0 fby (o + 1);
tel

node main(x : bool) returns (c : bool)
let
  automaton
    state One
      do
        automaton
          state A
            do c = x;
            until count() = 2 then B
          state B
            do c = not(x);
            until true then A
        end
      until true then Two
    state Two
      do c = x;
      until true then One
  end
tel