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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="org.intec.incheon.korea.project3_1_3.MainActivity">

<Button
android:id="@+id/button4"
android:layout_width="120dp"
android:layout_height="60dp"
android:onClick="BluetoothButton"
android:text="Bluetooth"

app:layout_constraintBottom_toBottomOf="@+id/button"
android:layout_marginBottom="0dp"
app:layout_constraintTop_toTopOf="@+id/button"
app:layout_constraintLeft_toLeftOf="@+id/webView"
android:layout_marginLeft="0dp" />

<Button
android:id="@+id/button"
android:layout_width="120dp"
android:layout_height="60dp"
android:layout_weight="0.11"
android:onClick="MyToolButton"
android:text="my tool"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.093"
app:layout_constraintHorizontal_bias="0.871"
android:layout_marginBottom="0dp" />

<WebView

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