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