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Flag semaphore - Wikipedia
Semaphore | Signaling, Telegraphy, Flags | Britannica
International Code of Signals - Wikipedia
Flag Semaphore - Online Decoder, Encoder, Translator
Semaphore Flag Signalling System - ANBG
Flag semaphore - Wikiwand
Semaphore flags - decoder, translator - Boxentriq
Flag semaphore - Simple English Wikipedia, the free encyclopedia
Semaphore - CIMT