ROOT (token: short_text [lag_newlines/spaces] {pos_id})             
 ¦--expr: {
  ( [0/0] {1}                                          
 ¦   ¦--'{': { [0/2] {2}                                            
 ¦   ¦--expr: (((
  [1/3] {3}                                      
 ¦   ¦   ¦--'(': ( [0/0] {4}                                        
 ¦   ¦   ¦--expr: ((
 2 [0/0] {5}                                  
 ¦   ¦   ¦   ¦--'(': ( [0/0] {6}                                    
 ¦   ¦   ¦   ¦--expr: (
 2
 [0/0] {7}                             
 ¦   ¦   ¦   ¦   ¦--'(': ( [0/1] {8}                                
 ¦   ¦   ¦   ¦   ¦--expr: 2 [1/4] {10}                              
 ¦   ¦   ¦   ¦   ¦   °--NUM_CONST: 2 [0/0] {9}                      
 ¦   ¦   ¦   ¦   °--')': ) [1/0] {11}                               
 ¦   ¦   ¦   °--')': ) [0/0] {12}                                   
 ¦   ¦   °--')': ) [0/0] {13}                                       
 ¦   °--'}': } [1/0] {14}                                           
 °--expr: {
{
  [2/0] {15}                                        
     ¦--'{': { [0/0] {16}                                           
     ¦--expr: {
    [1/0] {17}                                     
     ¦   ¦--'{': { [0/8] {18}                                       
     ¦   ¦--expr: call( [1/5] {19}                                  
     ¦   ¦   ¦--expr: call [0/0] {21}                               
     ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: call [0/0] {20}           
     ¦   ¦   ¦--'(': ( [0/10] {22}                                  
     ¦   ¦   ¦--expr: call1 [1/0] {23}                              
     ¦   ¦   ¦   ¦--expr: call1 [0/0] {25}                          
     ¦   ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: call1 [0/0] {24}      
     ¦   ¦   ¦   ¦--'(': ( [0/0] {26}                               
     ¦   ¦   ¦   ¦--expr: 2 [0/0] {28}                              
     ¦   ¦   ¦   ¦   °--NUM_CONST: 2 [0/0] {27}                     
     ¦   ¦   ¦   ¦--',': , [0/1] {29}                               
     ¦   ¦   ¦   ¦--expr: 3 [0/0] {31}                              
     ¦   ¦   ¦   ¦   °--NUM_CONST: 3 [0/0] {30}                     
     ¦   ¦   ¦   °--')': ) [0/0] {32}                               
     ¦   ¦   ¦--',': , [0/10] {33}                                  
     ¦   ¦   ¦--expr: {
    [1/1] {34}                             
     ¦   ¦   ¦   ¦--'{': { [0/15] {35}                              
     ¦   ¦   ¦   ¦--expr: sin(c [1/2] {36}                          
     ¦   ¦   ¦   ¦   ¦--expr: sin [0/0] {38}                        
     ¦   ¦   ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: sin [0/0] {37}    
     ¦   ¦   ¦   ¦   ¦--'(': ( [0/0] {39}                           
     ¦   ¦   ¦   ¦   ¦--expr: cos(p [0/0] {40}                      
     ¦   ¦   ¦   ¦   ¦   ¦--expr: cos [0/0] {42}                    
     ¦   ¦   ¦   ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: cos [0/0] {41}
     ¦   ¦   ¦   ¦   ¦   ¦--'(': ( [0/0] {43}                       
     ¦   ¦   ¦   ¦   ¦   ¦--expr: pi [0/0] {45}                     
     ¦   ¦   ¦   ¦   ¦   ¦   °--SYMBOL: pi [0/0] {44}               
     ¦   ¦   ¦   ¦   ¦   °--')': ) [0/0] {46}                       
     ¦   ¦   ¦   ¦   °--')': ) [0/0] {47}                           
     ¦   ¦   ¦   °--'}': } [1/0] {48}                               
     ¦   ¦   °--')': ) [0/0] {49}                                   
     ¦   °--'}': } [1/0] {50}                                       
     °--'}': } [1/0] {51}                                           
