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engaged signal▼[UK: ɪn.ˈɡeɪdʒd ˈsɪɡ.nəl] [US: en.ˈɡeɪdʒd ˈsɪɡ.nəl]
busy signal▼◼◼◼[UK: ˈbɪ.zi ˈsɪɡ.nəl] [US: ˈbɪ.zi ˈsɪɡ.nəl]
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