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In an action betwixt two parties, the Lords found, that any person, who had a tack for certain years enumerated in the tack, as a nineteen year or fifteen year tack, or sicklike, and where the tack was not specially for the tacksman's life-rent, he might not be witness to him who set the tack; but if the tack were a liferent-tack, he might be witness; wherein I perceive not any great reason of difference.