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    Example

    pillars=4, distance=10m, width=50cm.

    ,=50cm

    P1,,,,,,,,,,,,,,,,,,,,P2(,),,,,,,,,,,,,,,,,,,,,P3(,),,,,,,,,,,,,,,,,,,,,P4

    amount of , is 62

    62*50cm=31m

    31m=3100cm

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    because big pillars take up more space than little pillars