Drop-ins can and often do happen accidentally. Sometimes you're so focussed on your take-off that you just don't see the other rider.
The rules are fairly lax, but you have to know which ones you can bend.
Psychologist sues city for 100G, alleging beating by cop earlier this year
There exist different forms of this character, but I think we should not presume to make an etymology of a Chinese character without being authorized by the Shwǒ wǎn, the oldest and most genuine source of Chinese lexicography.
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