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two numbers such that they add up to target.

唧唧复唧唧，木兰当户织。

A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions.

WebSocket is a computer communications protocol, providing full-duplex communication channels over a single TCP connection.

A conceptual model is a representation of a system.

魏公子无忌者，魏昭王少子，而魏安釐王异母弟也。

刘秀在新野县时，听闻阴丽华的美貌，心悦之。