Celtic eased to a 3-nil win at home to St Mirren to go 13 points clear at the top of the Scottish Premiership.
The leaders took advantage of nearest challengers Rangers dropping points in a thrilling 3-all draw with Hibs at Easter Road.
Hearts have back-to-back league victories for the first time this season as they got past third-placed Dundee United 1-nil.
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Aberdeen's poor run continues in losing 2-nil away to Motherwell.
Elsewhere, bottom side St Johnstone suffered a 3-1 defeat to Dundee, while Ross County were 1-nil winners at Kilmarnock.
