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      Option A positions and sizes the risers so that the as-cast
        cluster of couplers is supported on the risers during "shake-out."  The
        coupler tabs are protected during the sand removal.   
      Each coupler is fed on each side by a riser, providing
        uniform metal feed into the coupler. Option
    A has the best size and locations for the risersGo on to the next design issue.
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