ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--expr:  [0/0] {1}                                   
 ¦   ¦--expr:  [0/0] {3}                               
 ¦   ¦   °--NUM_CONST: 1 [0/0] {2}                     
 ¦   ¦--'+': + [0/1] {4}                               
 ¦   ¦--expr:  [0/1] {6}                               
 ¦   ¦   ¦--'(': ( [0/2] {7}                           
 ¦   ¦   ¦--expr:  [1/0] {9}                           
 ¦   ¦   ¦   °--NUM_CONST: 3 [0/0] {8}                 
 ¦   ¦   °--')': ) [1/0] {10}                          
 ¦   ¦--SPECIAL-PIPE: %>% [0/0] {11}                   
 ¦   °--expr:  [1/0] {12}                              
 ¦       ¦--expr:  [0/0] {14}                          
 ¦       ¦   °--SYMBOL_FUNCTION_CALL: j [0/0] {13}     
 ¦       ¦--'(': ( [0/0] {15}                          
 ¦       °--')': ) [0/0] {16}                          
 ¦--expr:  [2/0] {17}                                  
 ¦   ¦--expr:  [0/1] {19}                              
 ¦   ¦   °--SYMBOL: a [0/0] {18}                       
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {20}                     
 ¦   ¦--expr:  [0/1] {22}                              
 ¦   ¦   ¦--expr:  [0/0] {24}                          
 ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: c [0/0] {23}     
 ¦   ¦   ¦--'(': ( [0/0] {25}                          
 ¦   ¦   ¦--expr:  [0/0] {27}                          
 ¦   ¦   ¦   °--SYMBOL: x [0/0] {26}                   
 ¦   ¦   ¦--',': , [0/1] {28}                          
 ¦   ¦   ¦--expr:  [0/0] {30}                          
 ¦   ¦   ¦   °--SYMBOL: y [0/0] {29}                   
 ¦   ¦   ¦--',': , [0/7] {31}                          
 ¦   ¦   ¦--expr:  [1/0] {33}                          
 ¦   ¦   ¦   °--SYMBOL: z [0/0] {32}                   
 ¦   ¦   °--')': ) [0/0] {34}                          
 ¦   ¦--SPECIAL-PIPE: %>% [0/0] {35}                   
 ¦   °--expr:  [1/0] {36}                              
 ¦       ¦--expr:  [0/0] {38}                          
 ¦       ¦   °--SYMBOL_FUNCTION_CALL: k [0/0] {37}     
 ¦       ¦--'(': ( [0/0] {39}                          
 ¦       °--')': ) [0/0] {40}                          
 °--expr:  [2/0] {41}                                  
     ¦--expr:  [0/1] {44}                              
     ¦   °--SYMBOL: a [0/0] {43}                       
     ¦--'+': + [0/1] {45}                              
     ¦--expr:  [0/3] {46}                              
     ¦   ¦--'(': ( [0/2] {47}                          
     ¦   ¦--expr:  [1/0] {49}                          
     ¦   ¦   °--SYMBOL: c [0/0] {48}                   
     ¦   °--')': ) [1/0] {50}                          
     ¦--'+': + [0/1] {51}                              
     ¦--expr:  [0/0] {53}                              
     ¦   ¦--'(': ( [0/1] {54}                          
     ¦   ¦--expr:  [1/0] {55}                          
     ¦   ¦   ¦--expr:  [0/0] {57}                      
     ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: c [0/0] {56} 
     ¦   ¦   ¦--'(': ( [0/2] {58}                      
     ¦   ¦   ¦--expr:  [1/5] {60}                      
     ¦   ¦   ¦   °--NUM_CONST: 2 [0/0] {59}            
     ¦   ¦   °--')': ) [1/0] {61}                      
     ¦   °--')': ) [1/0] {62}                          
     ¦--SPECIAL-PIPE: %>% [0/0] {63}                   
     °--expr:  [1/0] {64}                              
         ¦--expr:  [0/0] {66}                          
         ¦   °--SYMBOL_FUNCTION_CALL: j [0/0] {65}     
         ¦--'(': ( [0/0] {67}                          
         °--')': ) [0/0] {68}                          
