关注
(1) counts:
7dw: delete 7 words
4j: right move 4 letters
(2) modifier:
a: around
i: inside
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ci[ : change everything inside []
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%: jump back and force between parentheses
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da( : delete everything inside () including the parentheses itself.
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/<keyword> + n: next match of the keyword.
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. : repeat the previous editing command
