Range specifications select the exact lines of text on which the line
 editing command will operate.

 There are several general classes of range specifications:

     1.  Single line ranges specify a single line of text.
     2.  Multiple line ranges specify blocks of text, such as an entire buffer
         or all lines from the current line to the end of the buffer.
     3.  Compound ranges combine single line ranges with operators to specify
         multiple lines of text.
     4.  Noncontiguous ranges specify multiple lines that are not necessarily
         adjacent to one another.