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"The requirement of impartiality has two aspects. First, judges must not allow their judgment to be influenced by personal bias or prejudice, nor harbour preconceptions about the particular case before them, nor act in ways that improperly promote the interests of one of the parties to the detriment of the other. Second, the tribunal must also appear to a reasonable observer to be impartial. For instance, a trial substantially affected by the participation of a judge who, under domestic statutes, should have been disqualified cannot normally be considered to be impartial."
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