ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--COMMENT: #' th [0/0] {1}                           
 ¦--COMMENT: #' [1/0] {2}                              
 ¦--COMMENT: #' @e [1/0] {3}                           
 ¦--COMMENT: #' ca [1/0] {4}                           
 ¦--expr: NULL [1/0] {6}                               
 ¦   °--NULL_CONST: NULL [0/0] {5}                     
 ¦--COMMENT: #' th [3/0] {7}                           
 ¦--COMMENT: #' [1/0] {8}                              
 ¦--COMMENT: #' @e [1/0] {9}                           
 ¦--COMMENT: #' ca [1/0] {10}                          
 ¦--expr: NULL [1/0] {12}                              
 ¦   °--NULL_CONST: NULL [0/0] {11}                    
 ¦--COMMENT: #' th [2/0] {13}                          
 ¦--COMMENT: #' [1/0] {14}                             
 ¦--COMMENT: #' @e [1/0] {15}                          
 ¦--COMMENT: #' ca [1/0] {16}                          
 ¦--COMMENT: #' an [1/0] {17}                          
 ¦--expr: NULL [1/0] {19}                              
 ¦   °--NULL_CONST: NULL [0/0] {18}                    
 ¦--COMMENT: #' th [3/0] {20}                          
 ¦--COMMENT: #' [1/0] {21}                             
 ¦--COMMENT: #' @e [1/0] {22}                          
 ¦--COMMENT: #' ca [1/0] {23}                          
 ¦--COMMENT: #' an [1/0] {24}                          
 ¦--expr: NULL [1/0] {26}                              
 ¦   °--NULL_CONST: NULL [0/0] {25}                    
 ¦--expr: 'sing [2/0] {28}                             
 ¦   °--STR_CONST: 'sing [0/0] {27}                    
 ¦--expr: x <-  [2/1] {29}                             
 ¦   ¦--expr: x [0/1] {31}                             
 ¦   ¦   °--SYMBOL: x [0/0] {30}                       
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {32}                     
 ¦   °--expr: '	2' [0/0] {34}                         
 ¦       °--STR_CONST: '	2' [0/0] {33}                
 ¦--COMMENT: # the [0/0] {35}                          
 ¦--expr: x <-  [2/0] {36}                             
 ¦   ¦--expr: x [0/1] {38}                             
 ¦   ¦   °--SYMBOL: x [0/0] {37}                       
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {39}                     
 ¦   °--expr: '\001 [0/0] {41}                        
 ¦       °--STR_CONST: '\001 [0/0] {40}               
 ¦--expr: '\x01 [1/0] {43}                            
 ¦   °--STR_CONST: '\x01 [0/0] {42}                   
 ¦--COMMENT: # FIX [2/0] {44}                          
 °--COMMENT: # FIX [1/0] {45}                          
