5 has to fill up first chappy, water always finds it own level ,...

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    5 has to fill up first chappy, water always finds it own level ,

    5 then 2 then 7, provided that enough liquid is poured in the tube,

    If there is not enough liquid then only the tube at 5 and 6 will fill then overflow into cup two,

    Then the only cup to fill will be 2,
 
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