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<!-- notice expression1 used twice -->
<div ng-class="{class1 : expression1, class2 : expression1}">
Hello World!
</div>
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<section [ngClass]="{'class1':condition1, 'class2': condition2, 'class3':condition3}" >
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[ngClass]="[
expression1 ? 'class1 class2' : 'class3 class4',
expression2 ? 'class5' : 'class6',
]"
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<div ng-class="{class1 : expression1, class2 : expression2}">
Hello World!
</div>