EDIT—COPY subcommand syntax

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                                   .-*------.          
>>-+-COPY-+--+-line_1--+--------+--+--------+------+------------>
   '-CO---'  |         '-line_2-'  '-line_3-'      |   
             | .-*--------.  .-1-----.  .-*------. |   
             '-+-'string'-+--+-------+--+--------+-'   
                             '-count-'  '-line_4-'     

>--+-------------+---------------------------------------------><
   '-INCR(lines)-'