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<form method="post" action="<@common.url '/logout'/>">
<input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"/>
<button class="btn" type="submit"><@common.t k='key.button.logout'/></button>
</form>
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<form th:action="@{/logout}" method="post">
<input type="submit" th:value="LogOut" class="btn btn-warning"/>