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  pre {
    // find the first of my subscriptions in which I play the "thing" role
    sub_to_delete = Subscriptions:established("Rx_role","thing").firsthead();
  }
  if sub_to_delete then noop();
  fired {
    raise wrangler event "subscription_cancellation"
      attributes {"Tx":sub_to_delete{"Tx"}}
  }