<button onclick="showHelloWorld()">Show "Hello World"</button>
<button onclick="eraseHelloWorld()">Erase "Hello World"</button>
<p id="demoHelloWorld"></p>
<script>
function showHelloWorld() {
document.getElementById("demoHelloWorld").innerHTML = "Hello World";}
function eraseHelloWorld() {
document.getElementById("demoHelloWorld").innerHTML = "";}
</script>
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