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				@@ -30,17 +30,17 @@ 
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				             app:layout_constraintTop_toTopOf="parent" /> 
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				         <ImageView 
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				-            android:visibility="gone" 
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				             android:id="@+id/iv_scan" 
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				+            android:layout_width="wrap_content" 
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				+            android:layout_height="wrap_content" 
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				             android:paddingStart="12dp" 
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				-            android:paddingBottom="12dp" 
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				             android:paddingTop="12dp" 
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				-            app:layout_constraintRight_toLeftOf="@+id/iv_setting" 
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				-            app:layout_constraintBottom_toBottomOf="@+id/iv_setting" 
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				-            app:layout_constraintTop_toTopOf="@+id/iv_setting" 
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				+            android:paddingBottom="12dp" 
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				             android:src="@drawable/icon_scan" 
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				-            android:layout_width="wrap_content" 
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				-            android:layout_height="wrap_content"/> 
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				+            android:visibility="gone" 
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				+            app:layout_constraintBottom_toBottomOf="@+id/iv_setting" 
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				+            app:layout_constraintRight_toLeftOf="@+id/iv_setting" 
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				+            app:layout_constraintTop_toTopOf="@+id/iv_setting" /> 
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				         <ImageView 
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				             android:id="@+id/iv_setting" 
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				@@ -48,7 +48,7 @@ 
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				             android:layout_height="wrap_content" 
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				             android:layout_marginTop="15dp" 
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				             android:padding="15dp" 
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				-            android:src="@drawable/icon_setting" 
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				+            android:src="@drawable/icon_setting_teacher" 
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				             app:layout_constraintRight_toRightOf="parent" 
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				             app:layout_constraintTop_toBottomOf="@+id/view_status_bar" /> 
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