ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--COMMENT: #' Ex [0/0] {1}                           
 ¦--COMMENT: #' [1/0] {2}                              
 ¦--COMMENT: #' @e [1/0] {3}                           
 ¦--COMMENT: #' x  [1/0] {4}                           
 °--expr: NULL [1/0] {6}                               
     °--NULL_CONST: NULL [0/0] {5}                     
