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