app/src/main/res/layout/activity_main.xml


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<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:id="@+id/map" tools:context=".MainActivity"
    android:name="com.google.android.gms.maps.SupportMapFragment" />