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