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Chapter 722 build momentum
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... used this semaphore to achieve long-distance communication. Tricolor flag language used to be a compulsory subject for the corpse hunter assessment, but now it is an elective course in the super power academy. It has little practical significance, so Yang Dong has only done a rough study of the tricolor flag, but did not think about it. Had a chance to use it.
After a while, the tricolor flag was also waved on another building a few hundred meters away. Yang Dong raised the monocular to ...
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