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