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    This paragraph should be removed:

    Because of the edge-cases for tiny spirals, the size will be at least 5.

    There is nothing special about tiny spirals, not even for size == 1.

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    Sample test is for totally unrelated method.

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    A more elegant request would be to allow unlimited chaining of calculations. The result could be obtained by implementing to_s and to_f. E.g. puts Calc.new.one.plus.two.times.three # 9.0