ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr:  [0/0] {1}                                   
     ¦--expr:  [0/0] {6}                               
     ¦   °--NUM_CONST: 1 [0/0] {5}                     
     ¦--'+': + [0/0] {7}                               
     ¦--expr:  [0/0] {8}                               
     ¦   ¦--expr:  [0/0] {9}                           
     ¦   ¦   ¦--'-': - [0/0] {10}                      
     ¦   ¦   °--expr:  [0/0] {12}                      
     ¦   ¦       °--NUM_CONST: 1 [0/0] {11}            
     ¦   ¦--'/': / [0/0] {13}                          
     ¦   °--expr:  [0/0] {15}                          
     ¦       °--NUM_CONST: 2 [0/0] {14}                
     ¦--'-': - [0/0] {16}                              
     ¦--expr:  [0/0] {18}                              
     ¦   °--NUM_CONST: 3 [0/0] {17}                    
     ¦--'-': - [0/0] {19}                              
     ¦--expr:  [0/0] {20}                              
     ¦   ¦--'-': - [0/0] {21}                          
     ¦   °--expr:  [0/0] {23}                          
     ¦       °--NUM_CONST: 3 [0/0] {22}                
     ¦--'+': + [0/0] {24}                              
     °--expr:  [0/0] {25}                              
         ¦--'+': + [0/0] {26}                          
         °--expr:  [0/0] {28}                          
             °--NUM_CONST: 3 [0/0] {27}                
