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A logic designer may inadvertently select the design equations in such a way that stable states other than those of the flow table are formed. During malfunctions, it is possible for the circuit to assume a set of stable states that are not members of the original flow table, causing improper action. In some cases, it is impossible for the circuit to reassume the stable states of the flow table, creating a "critical situation." A safe circuit is one that is free of the critical situation.