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##Emacs, (削除) 10 (削除ここまで) 8 keystrokes

F3 C-1 0 * ENTER F4 C-9 F4

###Explanation F3 Starts a macro recording C-1 0 * Apply 10 times command '*': prints 10 asterix' ENTER Insert new line F4 Stops the macro record C-9 F4 Apply 9 times the macro

Thanks to Sean for saving two keystrokes, suggesting to replace C-udigit with C-digit.

Emacs, (削除) 10 (削除ここまで) 8 keystrokes

F3 C-1 0 * ENTER F4 C-9 F4

Explanation

F3 Starts a macro recording
C-1 0 * Apply 10 times command '*': prints 10 asterix'
ENTER Insert new line
F4 Stops the macro record
C-9 F4 Apply 9 times the macro

Thanks to Sean for saving two keystrokes, suggesting to replace C-udigit with C-digit.

##Emacs, 10 keystrokes

F3 C-u1 0 * ENTER F4 C-u9 F4

###Explanation F3 Starts a macro recording C-u 1 0 * Apply 10 times command '*': prints 10 asterix' ENTER Insert new line F4 Stops the macro record C-u 9 F4 Apply 9 times the macro

##Emacs, (削除) 10 (削除ここまで) 8 keystrokes

F3 C-1 0 * ENTER F4 C-9 F4

###Explanation F3 Starts a macro recording C-1 0 * Apply 10 times command '*': prints 10 asterix' ENTER Insert new line F4 Stops the macro record C-9 F4 Apply 9 times the macro

Thanks to Sean for saving two keystrokes, suggesting to replace C-udigit with C-digit.