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Lumber is wood after felling, usually after being sawn from the felled log.  

'''Lumber''' is wood after felling, usually after being sawn from the felled log.  

Lumber is often used to refer to sized boards which are at least rough sawn.   

Lumber is often used to refer to sized boards which are at least rough sawn.   

A lumberyard is a place where wood is prepared for sale.

A [[lumberyard]] is a place where wood is prepared for sale.