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The Marbles

by Kevin J. Lin

You are taking care of your friend's prized marble collection while he's at a marble collector's conference. You notice that his cleaning lady has disturbed one of his displays, shown below, not in its normal layout. The note beside the display says "five straight lines, each of exactly four marbles."

Right now you see two lines, each of exactly five marbles. Could they have been arranged as described, or has your friend lost his marbles?

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