ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr:  [0/0] {1}                                   
     ¦--expr:  [0/0] {4}                               
     ¦   °--NUM_CONST: 1 [0/0] {3}                     
     ¦--'+': + [0/2] {5}                               
     ¦--expr:  [0/0] {6}                               
     ¦   ¦--'+': + [0/0] {7}                           
     ¦   °--expr:  [0/0] {9}                           
     ¦       °--NUM_CONST: 1 [0/0] {8}                 
     ¦--'-': - [0/1] {10}                              
     °--expr:  [0/0] {11}                              
         ¦--expr:  [0/3] {14}                          
         ¦   °--NUM_CONST: 3 [0/0] {13}                
         ¦--'/': / [0/0] {15}                          
         ¦--expr:  [0/0] {17}                          
         ¦   °--NUM_CONST: 23 [0/0] {16}               
         ¦--'*': * [0/1] {18}                          
         °--expr:  [0/0] {19}                          
             ¦--expr:  [0/0] {21}                      
             ¦   °--NUM_CONST: 3 [0/0] {20}            
             ¦--'^': ^ [0/1] {22}                      
             °--expr:  [0/0] {24}                      
                 °--NUM_CONST: 4 [0/0] {23}            
