Suck, Inhale
Your mouth is like an escalator you use to suck and inhale things into your body.
If you're ever having trouble remembering how to suck or inhale, just picture an actual escalator that leads into your mouth. That'll definitely help.
きゅう
す
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Use this mouth ability to suck cucumbers (きゅう) into your mouth. Cucumbers are shaped like cylinders so you can suck them into your mouth like this. Just as nature intended.
You can inhale a cucumber too, I suppose, but don't tell anyone I told you to.