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• `.`: repeat the most recent Normal mode command
• `@:`: repeat the last Ex command

• `:` register always holds the most recently executed command line.
• After running `@:` for the first time, we can subsequently repeat it with the `@@` command.

Example: iterating through items in the buffer list with `:bn[ext]` or `:bp[revious]`.

• use `@:` for repeating
• use `` for revering (also works for `:next`/`:cnext`/`:tnext`)