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A
.gov website belongs to an official
government organization in the United States.
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A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Six nodes are connected via two kinds of links (blue link and black link). (b) Such a system can also be embedded into the framework of multiplex networks, where each link type defines a network layer. Besides, we also define the terminology: multiplex node and layer node in the total architecture and each layer, respectively.
