Holders Celtic will take on either Hearts or St Mirren in the William Hill Scottish Cup semi-finals at Hampden Park next month.
Neil Lennon's team knocked out Rangers' conquerors Dundee United on Sunday, beating them 4-0 at Tannadice and Hearts and St Mirren, who drew 2-2 at Tynecastle on Saturday, face a replay for the right to face the Hoops.
Aberdeen, 2-1 winners at Motherwell on Sunday, will play Hibernian who beat Ayr 2-0 on Saturday.
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