ROOT (token: short_text [lag_newlines/spaces] {pos_id})         
 ¦--expr: {
    [0/7] {1}                                      
 ¦   ¦--'{': { [0/10] {2}                                       
 ¦   ¦--expr: 1 + 1 [1/1] {3}                                   
 ¦   ¦   ¦--expr: 1 [0/1] {5}                                   
 ¦   ¦   ¦   °--NUM_CONST: 1 [0/0] {4}                          
 ¦   ¦   ¦--'+': + [0/1] {6}                                    
 ¦   ¦   °--expr: 1 [0/0] {8}                                   
 ¦   ¦       °--NUM_CONST: 1 [0/0] {7}                          
 ¦   °--'}': } [1/0] {9}                                        
 ¦--expr: {{{
2 [2/0] {10}                                     
 ¦   ¦--'{': { [0/0] {11}                                       
 ¦   ¦--expr: {{
25 [0/0] {12}                                 
 ¦   ¦   ¦--'{': { [0/0] {13}                                   
 ¦   ¦   ¦--expr: {
25  [0/0] {14}                             
 ¦   ¦   ¦   ¦--'{': { [0/0] {15}                               
 ¦   ¦   ¦   ¦--expr: 25 *  [1/7] {16}                          
 ¦   ¦   ¦   ¦   ¦--expr: 25 [0/1] {18}                         
 ¦   ¦   ¦   ¦   ¦   °--NUM_CONST: 25 [0/0] {17}                
 ¦   ¦   ¦   ¦   ¦--'*': * [0/1] {19}                           
 ¦   ¦   ¦   ¦   °--expr: 4 [0/0] {21}                          
 ¦   ¦   ¦   ¦       °--NUM_CONST: 4 [0/0] {20}                 
 ¦   ¦   ¦   °--'}': } [1/0] {22}                               
 ¦   ¦   °--'}': } [0/0] {23}                                   
 ¦   °--'}': } [0/0] {24}                                       
 °--expr: {
{
  [2/0] {25}                                    
     ¦--'{': { [0/0] {26}                                       
     ¦--expr: {
  1 [1/0] {27}                                 
     ¦   ¦--'{': { [0/2] {28}                                   
     ¦   ¦--expr: 1 + 1 [1/0] {29}                              
     ¦   ¦   ¦--expr: 1 [0/1] {31}                              
     ¦   ¦   ¦   °--NUM_CONST: 1 [0/0] {30}                     
     ¦   ¦   ¦--'+': + [0/1] {32}                               
     ¦   ¦   °--expr: 142 * [0/0] {33}                          
     ¦   ¦       ¦--expr: 142 [0/1] {35}                        
     ¦   ¦       ¦   °--NUM_CONST: 142 [0/0] {34}               
     ¦   ¦       ¦--'*': * [0/1] {36}                           
     ¦   ¦       °--expr: sin(p [0/0] {37}                      
     ¦   ¦           ¦--expr: sin [0/0] {39}                    
     ¦   ¦           ¦   °--SYMBOL_FUNCTION_CALL: sin [0/0] {38}
     ¦   ¦           ¦--'(': ( [0/0] {40}                       
     ¦   ¦           ¦--expr: pi [0/0] {42}                     
     ¦   ¦           ¦   °--SYMBOL: pi [0/0] {41}               
     ¦   ¦           °--')': ) [0/0] {43}                       
     ¦   °--'}': } [1/0] {44}                                   
     °--'}': } [1/0] {45}                                       
