ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--COMMENT: # = r [0/0] {1}                           
 ¦--expr:  [1/0] {1.9}                                 
 ¦   ¦--expr:  [0/1] {3}                               
 ¦   ¦   °--SYMBOL: a [0/0] {2}                        
 ¦   ¦--EQ_ASSIGN: = [0/1] {4}                         
 ¦   °--expr:  [0/0] {6}                               
 ¦       °--NUM_CONST: 3 [0/0] {5}                     
 ¦--expr:  [1/0] {7}                                   
 ¦   ¦--expr:  [0/0] {9}                               
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: data_ [0/0] {8}      
 ¦   ¦--'(': ( [0/0] {10}                              
 ¦   ¦--SYMBOL_SUB: a [0/1] {11}                       
 ¦   ¦--EQ_SUB: = [0/1] {12}                           
 ¦   ¦--expr:  [0/0] {14}                              
 ¦   ¦   °--NUM_CONST: 3 [0/0] {13}                    
 ¦   °--')': ) [0/0] {15}                              
 ¦--COMMENT: # sem [2/0] {16}                          
 ¦--expr:  [1/0] {18}                                  
 ¦   °--SYMBOL: a [0/0] {17}                           
 ¦--';': ; [0/1] {19}                                  
 ¦--expr:  [0/1] {21}                                  
 ¦   °--SYMBOL: b [0/0] {20}                           
 ¦--';': ; [0/0] {22}                                  
 ¦--expr:  [0/0] {24}                                  
 ¦   °--SYMBOL: c [0/0] {23}                           
 ¦--';': ; [0/0] {25}                                  
 ¦--expr:  [0/0] {27}                                  
 ¦   °--SYMBOL: d [0/0] {26}                           
 ¦--COMMENT: # quo [3/0] {28}                          
 ¦--expr:  [1/0] {30}                                  
 ¦   °--STR_CONST: "text [0/0] {29}                    
 ¦--expr:  [1/0] {32}                                  
 ¦   °--STR_CONST: 'text [0/0] {31}                    
 ¦--COMMENT: # no  [3/0] {33}                          
 ¦--expr:  [1/0] {34}                                  
 ¦   ¦--expr:  [0/1] {37}                              
 ¦   ¦   °--SYMBOL: a [0/0] {36}                       
 ¦   ¦--SPECIAL-PIPE: %>% [0/1] {38}                   
 ¦   ¦--expr:  [0/1] {39}                              
 ¦   ¦   ¦--expr:  [0/0] {41}                          
 ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: b [0/0] {40}     
 ¦   ¦   ¦--'(': ( [0/0] {42}                          
 ¦   ¦   °--')': ) [0/0] {43}                          
 ¦   ¦--SPECIAL-PIPE: %>% [0/0] {44}                   
 ¦   °--expr:  [0/0] {45}                              
 ¦       ¦--expr:  [0/0] {47}                          
 ¦       ¦   °--SYMBOL_FUNCTION_CALL: c [0/0] {46}     
 ¦       ¦--'(': ( [0/0] {48}                          
 ¦       °--')': ) [0/0] {49}                          
 ¦--COMMENT: # lin [2/0] {50}                          
 ¦--expr:  [1/0] {51}                                  
 ¦   ¦--expr:  [0/1] {54}                              
 ¦   ¦   °--SYMBOL: a [0/0] {53}                       
 ¦   ¦--SPECIAL-PIPE: %>% [0/2] {55}                   
 ¦   ¦--expr:  [1/1] {56}                              
 ¦   ¦   ¦--expr:  [0/0] {58}                          
 ¦   ¦   ¦   °--SYMBOL_FUNCTION_CALL: b [0/0] {57}     
 ¦   ¦   ¦--'(': ( [0/0] {59}                          
 ¦   ¦   °--')': ) [0/0] {60}                          
 ¦   ¦--SPECIAL-PIPE: %>% [0/0] {61}                   
 ¦   °--expr:  [0/0] {62}                              
 ¦       ¦--expr:  [0/0] {64}                          
 ¦       ¦   °--SYMBOL_FUNCTION_CALL: c [0/0] {63}     
 ¦       ¦--'(': ( [0/0] {65}                          
 ¦       °--')': ) [0/0] {66}                          
 ¦--COMMENT: # add [2/0] {67}                          
 ¦--expr:  [1/0] {68}                                  
 ¦   ¦--expr:  [0/1] {71}                              
 ¦   ¦   °--SYMBOL: a [0/0] {70}                       
 ¦   ¦--SPECIAL-PIPE: %>% [0/2] {72}                   
 ¦   ¦--expr:  [1/1] {74}                              
 ¦   ¦   °--SYMBOL: b [0/0] {73}                       
 ¦   ¦--SPECIAL-PIPE: %>% [0/2] {75}                   
 ¦   °--expr:  [1/0] {77}                              
 ¦       °--SYMBOL: c [0/0] {76}                       
 ¦--COMMENT: # add [2/0] {78}                          
 °--expr:  [1/0] {79}                                  
     ¦--expr:  [0/1] {82}                              
     ¦   °--SYMBOL: a [0/0] {81}                       
     ¦--SPECIAL-PIPE: %>% [0/1] {83}                   
     ¦--expr:  [0/1] {85}                              
     ¦   °--SYMBOL: b [0/0] {84}                       
     ¦--SPECIAL-PIPE: %>% [0/2] {86}                   
     °--expr:  [1/0] {88}                              
         °--SYMBOL: c [0/0] {87}                       
