Problem: What is the name of the celebration held for a man shortly before his wedding?
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A: stag night

Problem: On which river do Halifax and Wakefield stand
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A: calder

Problem: On the human body, Walrus, Pencil and Toothbrush are all types of what?
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A: moustache

Problem: Geographic features called rilles that come in sinuous, arcuate and straight types are a prominent part of the landscape where?
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A:
moon