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    $\begingroup$ This is the best answer of all +1 $\endgroup$
    – justhalf
    Commented Feb 5, 2023 at 10:08
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    $\begingroup$ Well, except that there is one more sentence missing. The one with the final number actually stated. $\endgroup$
    – Boba Fit
    Commented Feb 5, 2023 at 20:09
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    $\begingroup$ Regarding the horizontal sides, it is not clear that what you tell us to do will make your conclusion plain. Please could you clarify? $\endgroup$
    – Rosie F
    Commented Feb 7, 2023 at 9:19
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    $\begingroup$ @RosieF Consider the sections that slide as a single piece--if the top moves by a certain distance, the bottom moves by the exact same distance. $\endgroup$ Commented Feb 8, 2023 at 15:38