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Returns the set of features it supports for a given voice. Features can either be framework defined, e.g. NoType:android/speech/tts/TextToSpeech$Engine;Href=../../../../reference/android/speech/tts/TextToSpeech.Engine.html#KEY_FEATURE_NETWORK_TIMEOUT_MS or engine specific. Engine specific keys must be prefixed by the name of the engine they are intended for. These keys can be used as parameters to TextToSpeech.speak(java.lang.String, int, java.util.HashMap<java.lang.String, java.lang.String>) and TextToSpeech.synthesizeToFile(java.lang.String, java.util.HashMap<java.lang.String, java.lang.String>, java.lang.String). Features values are strings and their values must met restrictions described in their documentation.