In the table, do the following things:
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Add three rows with dashes after the first row
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Divide the columns with pipes
colomn 1 column 2 column 3 value 1 value 2 value 3 value 1 value 2 value 3 value 1 value 2 value 3 value 1 value 2 value 3
r<char> - Replace the selection with the given character
v - Visual mode
<SHIFT-v> - Row visual mode
<CTRL-v> - Column visual mode