题目要求与弹出条件的对应关系：
Number of connections — Leading VPNs let you connect an unlimited number of devices with the same account, while others limit you to just a single device. Prioritize services that offer multiple simultaneous connections so you can stay secure on all your devices at the same time. You might stream pornography on a number of devices, so it's best to secure everything with the same account.
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单房收入在减少，房租却越来越贵
If we don't have a bucket, we can allocate it out of the next larger slot