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Apparently you have never tried wagon wheels.

They are biscuits topped with marshmallow and covered in a chocolate flavoured coating. http://en.wikipedia.org/wiki/Wagon_Wheels

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I'd completely forgotten about those, you've successfully invalidated my metaphor. My A-Level electronics teacher used to get us wagon wheels every time he forgot to review our prep (basically every week)

"The biscuit itself is round to represent the wheel of a wagon"

Really? They must have gone through great lengths and a lot of experimentation before they were finally successful in creating that shape.

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