The line entities are:

     L   Specifies the entire line in which the cursor is positioned.
     BL  Specifies all characters preceding the cursor up to the beginning
         of a line.  (When the cursor is positioned at the beginning of a
         line, the BL entity selects the entire previous line.)
     EL  Specifies all characters from the cursor to the end of a line,
         including the character on which the cursor is positioned.
         (If the cursor is on a line terminator, the entire next line is
         selected.)
     NL  Specifies all characters from the cursor to the beginning of the
         next line, including the character on which the cursor is
         positioned.