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    This problem is very difficult to understand, I still don't understand what the question is.
    E.g. ".. after I save 12"... 12 what? days? weeks? units of money? Ah! It's after the saturday where I saved 12 units. Difficult to catch.
    Then there is a table of days with missing values... is it zero?
    And finally, what's the point of mentioning the planet? Just to number the weeks?

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    Allows duplicates in result.