With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Phil Mickelson competed in a golf championship August 12th through 15th of 2005.
text_B: A bedform is a feature that develops at the interface of fluid and a moveable bed , the result of bed material being moved by fluid flow .. Examples include ripples and dunes on the bed of a river .. ripples. Current ripples. river. river. Bedforms are often preserved in the rock record as a result of being present in a depositional setting .. depositional. Deposition ( sediment ). Bedforms are often characteristic to the flow parameters , and may be used to infer flow depth and velocity , and therefore the Froude number .. Froude number. Froude number
not_related.