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protected static final String QUERY_PATTERN = "([a-zA-Z][a-zA-Z0-9_]*) (==|<|<=|>=|>) ([0-9])*";
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protected static final String LOCK_BOOL = "lock";
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protected Hashtable<TimedInputArc, String> inputArcsToCounters = new Hashtable<TimedInputArc, String>();
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protected Hashtable<TimedInhibitorArc, String> inhibitorArcsToCounters = new Hashtable<TimedInhibitorArc, String>();
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protected Hashtable<TransportArc, String> transportArcsToCounters = new Hashtable<TransportArc, String>();