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digraph Coin {

  planchet [color=blue, shape="box"];
  fresh [color=blue, label="fresh coin", shape="box"];
  rs [color=blue, label="refresh session", shape="box"];
  partial [color=blue, label="dirty coin", shape="box"];
  revoked [color=blue, label="revoked coin", shape="box"];
  zombie [color=blue, label="zombie coin", shape="box"];
  spent [color=blue, label="spent coin", shape="box"];
  wired [color=blue, label="wired coin", shape="doublecircle"];
  expired [color=blue, label="expired coin", shape="doublecircle"];

  subgraph {
    rank = same; spent; expired;
  }

  subgraph {
    withdraw; melt;
  }

  subgraph {
    rank = same; melt; reveal; rs;
  }


  planchet->withdraw;
  planchet->melt;
  withdraw->fresh;
  fresh->deposit;
  fresh->melt;
  deposit->partial;
  deposit->spent;
  melt->rs;
  rs->reveal;
  reveal->fresh;
  melt->partial;
  melt->spent;
  spent->refund;
  refund->partial;
  spent->wired [style=dotted];
  partial->expired [style=dotted];
  partial->melt;
  partial->deposit [color=red];
  fresh->expired [style=dotted];
  fresh->revoked [style=dotted];
  revoked->recoup;
  recoup->zombie;
  zombie->melt;
}