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<button type="button" class="btn btn-primary">primary</button>
<button type="button" class="btn btn-secondary">secondary</button>
<button type="button" class="btn btn-success">success</button>
<button type="button" class="btn btn-info">info</button>
<button type="button" class="btn btn-warning">warning</button>
<button type="button" class="btn btn-danger">danger</button>
<button type="button" class="btn btn-dark">dark</buton>
<button type="button" class="btn btn-light">light</button>
<button type="button" class="btn btn-link">link</button>