ul {
display: table; margin: 0 auto;}<html><body> <ul> <li>56456456</li> <li>4564564564564649999999999999999999999999999996</li> <li>45645</li> </ul></body></html>
ul {
display: table; margin: 0 auto;}<html><body> <ul> <li>56456456</li> <li>4564564564564649999999999999999999999999999996</li> <li>45645</li> </ul></body></html>
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