// 步骤3：遍历排序后的位置，用单调栈判断独立车队
Fast forward a year: they get a new phone and set up the messaging app. They aren’t prompted to use a passkey because one no longer exists in their credential manager. Instead, they use phone number verification to recover their account. They are then guided through the “restore backup” flow and prompted for their passkey.
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Payment plans often require an upgrade if you exceed a certain sales amount per year.
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