Potential answers for "Dubious communication method"

⭐⭐⭐⭐ ESP
⭐⭐⭐ ASL
⭐⭐⭐ WAGGLEDANCE
⭐⭐⭐ EMAIL
⭐⭐⭐ SIGNLANGUAGE
⭐⭐⭐ SONAR
⭐⭐⭐ TINCANTELEPHONE
⭐⭐⭐ SMOKESIGNAL

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