// Synthesized 3-bit token ring.

constant N := 3;

direct variable t[N] < 2;
puppet variable e[N] < 2;
puppet variable ready[N] < 2;

// Make the invariant exactly this, no smoothing over puppet variables is allowed.
(future & shadow)
  // One process has the token.
  (unique i < N :
   i == 0 && t[i-1] == t[i]
   ||
   i != 0 && t[i-1] != t[i]
  );


process Bot[i < 1]
{
  read:  e[i-1], t[i-1];
  write: e[i], t[i], ready[i];
  // Enforce this behavior within the invariant:
  shadow action:( t[i-1] == t[i] --> t[i] := 1 - t[i-1]; );
  // Use these actions:
  puppet action:
    ( e[i-1]==1 && t[i-1]==0 && e[i]==1 && t[i]==0 && ready[i]==0 --> e[i]:=0; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==1 && t[i]==0 && ready[i]==1 --> e[i]:=0; t[i]:=0; ready[i]:=1; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==0 && t[i]==0 && ready[i]==1 --> e[i]:=1; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==0 && t[i]==0 && ready[i]==0 --> e[i]:=0; t[i]:=1; ready[i]:=1; )
    ( e[i-1]==1 && t[i-1]==1 && e[i]==0 && t[i]==0 && ready[i]==1 --> e[i]:=1; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==1 && e[i]==0 && t[i]==0 && ready[i]==0 --> e[i]:=1; t[i]:=0; ready[i]:=1; )
    ( e[i-1]==1 && t[i-1]==1 && e[i]==1 && t[i]==1 && ready[i]==1 --> e[i]:=0; t[i]:=1; ready[i]:=1; )
    ( e[i-1]==1 && t[i-1]==1 && e[i]==1 && t[i]==1 && ready[i]==0 --> e[i]:=0; t[i]:=1; ready[i]:=1; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==0 && t[i]==1 && ready[i]==1 --> e[i]:=1; t[i]:=1; ready[i]:=1; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==0 && t[i]==1 && ready[i]==0 --> e[i]:=1; t[i]:=1; ready[i]:=0; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==1 && t[i]==1 && ready[i]==1 --> e[i]:=0; t[i]:=1; ready[i]:=1; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==1 && t[i]==1 && ready[i]==0 --> e[i]:=0; t[i]:=1; ready[i]:=1; )
    ( e[i-1]==0 && t[i-1]==1 && e[i]==0 && t[i]==1 && ready[i]==1 --> e[i]:=0; t[i]:=0; ready[i]:=1; )
    ( e[i-1]==0 && t[i-1]==1 && e[i]==0 && t[i]==1 && ready[i]==0 --> e[i]:=1; t[i]:=1; ready[i]:=1; )
    ;
}

process P[i <- map tid < N-1 : tid+1]
{
  read:  e[i-1], t[i-1];
  write: e[i], t[i], ready[i];
  // Enforce this behavior within the invariant:
  shadow action:( t[i-1] != t[i] --> t[i] := t[i-1]; );
  // Use these actions:
  puppet action:
    ( e[i-1]==1 && t[i-1]==1 && e[i]==1 && t[i]==1 && ready[i]==1 --> e[i]:=1; t[i]:=1; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==1 && e[i]==0 && t[i]==1 && ready[i]==1 --> e[i]:=1; t[i]:=1; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==1 && e[i]==0 && t[i]==1 && ready[i]==0 --> e[i]:=1; t[i]:=1; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==1 && e[i]==1 && t[i]==0 && ready[i]==0 --> e[i]:=0; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==0 && t[i-1]==1 && e[i]==1 && t[i]==1 && ready[i]==0 --> e[i]:=0; t[i]:=1; ready[i]:=0; )
    ( e[i-1]==0 && t[i-1]==1 && e[i]==1 && t[i]==1 && ready[i]==1 --> e[i]:=0; t[i]:=1; ready[i]:=0; )
    ( e[i-1]==0 && t[i-1]==1 && e[i]==0 && t[i]==0 && ready[i]==1 --> e[i]:=1; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==0 && t[i]==0 && ready[i]==0 --> e[i]:=1; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==0 && t[i]==0 && ready[i]==1 --> e[i]:=1; t[i]:=0; ready[i]:=1; )
    ( e[i-1]==1 && t[i-1]==1 && e[i]==1 && t[i]==0 && ready[i]==1 --> e[i]:=0; t[i]:=0; ready[i]:=1; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==1 && t[i]==0 && ready[i]==1 --> e[i]:=0; t[i]:=0; ready[i]:=1; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==1 && t[i]==0 && ready[i]==0 --> e[i]:=0; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==0 && t[i-1]==1 && e[i]==0 && t[i]==0 && ready[i]==0 --> e[i]:=0; t[i]:=1; ready[i]:=0; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==0 && t[i]==1 && ready[i]==0 --> e[i]:=0; t[i]:=0; ready[i]:=1; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==0 && t[i]==1 && ready[i]==1 --> e[i]:=0; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==1 && t[i]==1 && ready[i]==0 --> e[i]:=1; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==1 && t[i]==1 && ready[i]==1 --> e[i]:=1; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==0 && t[i]==1 && ready[i]==1 --> e[i]:=1; t[i]:=0; ready[i]:=0; )
    ( e[i-1]==1 && t[i-1]==0 && e[i]==0 && t[i]==1 && ready[i]==0 --> e[i]:=1; t[i]:=0; ready[i]:=1; )
    ( e[i-1]==0 && t[i-1]==0 && e[i]==1 && t[i]==1 && ready[i]==0 --> e[i]:=1; t[i]:=1; ready[i]:=1; )
    ;
}