ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--expr: 1 +
  [0/0] {1}                             
 ¦   ¦--expr: 1 [0/1] {6}                              
 ¦   ¦   °--NUM_CONST: 1 [0/0] {5}                     
 ¦   ¦--'+': + [0/7] {7}                               
 ¦   ¦--expr: 2 [1/1] {9}                              
 ¦   ¦   °--NUM_CONST: 2 [0/0] {8}                     
 ¦   ¦--'+': + [0/0] {10}                              
 ¦   ¦--expr: 3 [1/1] {12}                             
 ¦   ¦   °--NUM_CONST: 3 [0/0] {11}                    
 ¦   ¦--'+': + [0/7] {13}                              
 ¦   ¦--expr: 4 [1/1] {15}                             
 ¦   ¦   °--NUM_CONST: 4 [0/0] {14}                    
 ¦   ¦--'-': - [0/2] {16}                              
 ¦   °--expr: 5 [1/0] {18}                             
 ¦       °--NUM_CONST: 5 [0/0] {17}                    
 °--expr: 1 + 1 [2/0] {19}                             
     ¦--expr: 1 [0/1] {21}                             
     ¦   °--NUM_CONST: 1 [0/0] {20}                    
     ¦--'+': + [0/1] {22}                              
     °--expr: 1 [0/0] {24}                             
         °--NUM_CONST: 1 [0/0] {23}                    
