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In page Pitmatic:

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Traditionally, the dialect used the Northumbrian burr, wherein /r/ is realised as [ʁ].[5] This is now very rare.[6]: 40  As a result of the burr, the traditional dialect undergoes the Nurse-north merger in words like forst 'first' and bord 'bird', which came about as a result of burr modification.[citation needed]