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<?xml version="1.0" encoding="utf-8"?><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">    <PreferenceCategory        android:title="@string/settings_developer"        android:key="pref_key_developer">        <SwitchPreference            android:key="aec"            android:title="@string/AEC"            android:summary="@string/acoustic_echo_cancellation"            android:defaultValue="true" />    </PreferenceCategory></PreferenceScreen>