Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:6 shows that if state converges in finite time to the EP, then also the output converges in finite time to the corresponding OEP, however Example 2 in [22] give the conclusion that state converges in fintie time to the EP, but the output does not converge in finite time to the OEP.
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