ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--expr:  [0/0] {1}                                   
 ¦   ¦--expr:  [0/0] {3}                               
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: a [0/0] {2}          
 ¦   ¦--'(': ( [0/0] {4}                               
 ¦   ¦--expr:  [0/0] {5}                               
 ¦   ¦   ¦--'!': ! [0/1] {6}                           
 ¦   ¦   °--expr:  [0/0] {7}                           
 ¦   ¦       ¦--'!': ! [0/0] {8}                       
 ¦   ¦       °--expr:  [0/0] {9}                       
 ¦   ¦           ¦--'!': ! [0/0] {10}                  
 ¦   ¦           °--expr:  [0/0] {12}                  
 ¦   ¦               °--SYMBOL: x [0/0] {11}           
 ¦   °--')': ) [0/0] {13}                              
 ¦--expr:  [1/0] {14}                                  
 ¦   ¦--expr:  [0/0] {16}                              
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: k [0/0] {15}         
 ¦   ¦--'(': ( [0/0] {17}                              
 ¦   ¦--expr:  [0/0] {18}                              
 ¦   ¦   ¦--'!': ! [0/0] {19}                          
 ¦   ¦   °--expr:  [0/0] {20}                          
 ¦   ¦       ¦--'!': ! [0/0] {21}                      
 ¦   ¦       °--expr:  [0/0] {23}                      
 ¦   ¦           °--SYMBOL: g [0/0] {22}               
 ¦   °--')': ) [0/0] {24}                              
 ¦--expr:  [1/0] {25}                                  
 ¦   ¦--expr:  [0/0] {27}                              
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: a [0/0] {26}         
 ¦   ¦--'(': ( [0/0] {28}                              
 ¦   ¦--expr:  [0/0] {29}                              
 ¦   ¦   ¦--'!': ! [0/0] {30}                          
 ¦   ¦   °--expr:  [0/0] {31}                          
 ¦   ¦       ¦--'!': ! [0/0] {32}                      
 ¦   ¦       °--expr:  [0/0] {33}                      
 ¦   ¦           ¦--'!': ! [0/0] {34}                  
 ¦   ¦           °--expr:  [0/0] {36}                  
 ¦   ¦               °--SYMBOL: x [0/0] {35}           
 ¦   °--')': ) [0/0] {37}                              
 ¦--expr:  [1/0] {38}                                  
 ¦   ¦--expr:  [0/0] {40}                              
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: a [0/0] {39}         
 ¦   ¦--'(': ( [0/0] {41}                              
 ¦   ¦--expr:  [0/0] {42}                              
 ¦   ¦   ¦--'!': ! [0/0] {43}                          
 ¦   ¦   °--expr:  [0/0] {44}                          
 ¦   ¦       ¦--'!': ! [0/1] {45}                      
 ¦   ¦       °--expr:  [0/0] {46}                      
 ¦   ¦           ¦--'!': ! [0/0] {47}                  
 ¦   ¦           °--expr:  [0/0] {49}                  
 ¦   ¦               °--SYMBOL: x [0/0] {48}           
 ¦   °--')': ) [0/0] {50}                              
 °--expr:  [1/0] {51}                                  
     ¦--expr:  [0/0] {53}                              
     ¦   °--SYMBOL_FUNCTION_CALL: a [0/0] {52}         
     ¦--'(': ( [0/0] {54}                              
     ¦--expr:  [0/0] {55}                              
     ¦   ¦--'!': ! [0/0] {56}                          
     ¦   °--expr:  [0/0] {58}                          
     ¦       °--SYMBOL: b [0/0] {57}                   
     °--')': ) [0/0] {59}                              
