TL;DR: Last Pass is broken. All passwords at the time of the breach were taken. They also got internal secrets from a laptop and can now probably throw computational power at anything they want to decrypt.
Switch. Do not use. Change everything you have if you were using it. Treat everything as breached.
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for every different website? that's a lot of four words
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It's not that hard until the time you have to remember one you haven't used in 5 years
That's amazing! I've got the same password on my luggage!
That's vulnerable to a dictionary attack though.