Left: vehicle 车 (車= cart from above with axle 丨, load-area 日 wheels 二), right: whisper 咠 (from the mouth 口 to the ear 耳) - But here: 口 = 1 parking space and 耳 = 3 parking spaces
Mnemonic
If the vehicles are not each in one space, but together in (a group of) three, they are gathered up.
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