An apparatus 1, wherein the second stage receiving container comprises a feed opening, wherein the channel connects the discharge members of the first stage receiving containers to the feed opening, and wherein {TAIL ~ the alternating device} comprises a control device configured to control {HEAD ~ the shut off members} in an alternating manner 
An apparatus 1 , wherein the second stage receiving container comprises a feed opening , wherein the channel connects the discharge members of the first stage receiving containers to the feed opening , and wherein { TAIL ~ the alternating device } comprises a control device configured to control { HEAD ~ the shut off members } in an alternating manner
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