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Message: <blockquote data-quote="chas_m" data-source="post: 1636787">You may see some issues with Mail (particularly if you use Mail for Gmail or Outlook), Wi-Fi (occasionally issues reconnecting after sleep, or abnormally slow performance) or Bluetooth (occasional refusal to connect).I have been using Yosemite for many months now and have only seen issues with the last one (occasional Bluetooth bullheadedness, a restart fixes it but annoying), but others have reported these issues. It's not apparently universal, however, so you may never notice anything.There is a whole raft of new tricks your Mac can do if you have an iOS device around and a recent-model Mac (2012 or later), and a whole raft of general improvements. But as I find I have to remind people a LOT these days, x.1 or even x.2 is early days with a new major OS upgrade.</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?