Don't be afriad to try to work the kun's into the mnemonic if you can, though for most of them it's kind of hard ("what the hell sounds like momekenokara")
and you might find twenty easy in the future and want to increase. Unless you want to spent your last month doing like 500 a day, I would suggest to resist the urge!
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"Biting is excellent- it's like kissing only there's a winner."