the best system is to have around 6-7 passwords that you use in rotation. Then if ya forget which one you used for which site, just try em all. Best compromise between security and convenience

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Fee Fi Fo Fum, now bitch I'm a giant
And your ass is like Jack, but your magic beans is wack
Skills is what you lack
I'm like a Benz, you ain't even like a Cadillac
Ya more like a Reagal
I'm a pittbull and you's a beagel