| 摘要 |
An apparatus comprising a main portion, a connector and a receptacle. The main portion may have a top, a first side, a second side and a bottom. The connector may be rigidly positioned to extend from the main portion near said first side. The receptacle may be positioned within the main portion near the second side. The connector may be configured to lock into a second receptacle having a similar configuration as said first receptacle.
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