Potential answers for "Systems of signals"

⭐⭐⭐⭐ CODES
⭐⭐⭐ AOKS
⭐ SONARS
⭐ RRS
⭐ NODS
⭐ DITS
⭐ SEMAPHORES
⭐ WIGWAGS
⭐ TESTPATTERNS
⭐ PAS

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