| 摘要 |
Groups comprising a specified number of articles separated by intervals of separation are formed from an incoming flow of articles. The process involves interacting with the flow of articles in such a way as to bring about, in a coordinated manner: a slowing action on at least one article situated in the forwardmost position of its particular group, and an accelerating action on at least one article situated in the rearmost position of its particular group.
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