ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr:  [0/0] {1}                                   
     ¦--expr:  [0/1] {3}                               
     ¦   °--SYMBOL: q [0/0] {2}                        
     ¦--LEFT_ASSIGN: <- [0/2] {4}                      
     ¦--expr:  [0/0] {9}                               
     ¦   °--SYMBOL: a [0/0] {8}                        
     ¦--'+': + [0/2] {10}                              
     ¦--expr:  [1/1] {11}                              
     ¦   ¦--'-': - [0/1] {12}                          
     ¦   °--expr:  [0/0] {14}                          
     ¦       °--NUM_CONST: 3 [0/0] {13}                
     ¦--'+': + [0/0] {15}                              
     ¦--expr:  [1/0] {17}                              
     ¦   °--NUM_CONST: 2 [0/0] {16}                    
     ¦--'+': + [0/0] {18}                              
     ¦--expr:  [1/0] {20}                              
     ¦   ¦--expr:  [0/0] {22}                          
     ¦   ¦   °--SYMBOL_FUNCTION_CALL: g [0/0] {21}     
     ¦   ¦--'(': ( [0/0] {23}                          
     ¦   °--')': ) [0/0] {24}                          
     ¦--SPECIAL-PIPE: %>% [0/3] {25}                   
     °--expr:  [1/0] {26}                              
         ¦--expr:  [0/0] {28}                          
         ¦   °--SYMBOL_FUNCTION_CALL: k [0/0] {27}     
         ¦--'(': ( [0/0] {29}                          
         °--')': ) [0/0] {30}                          
