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https://community.docusign.com/ideas/what-is-the-24-hour-rule-for-lufthansa-%EF%BD%8C%EF%BD%89%EF%BD%96%EF%BD%85-%EF%BD%88%EF%BD%95%EF%BD%8D%EF%BD%81%EF%BD%8E-13388