ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr:  [0/0] {1}                                   
     ¦--expr:  [0/1] {2}                               
     ¦   ¦--expr:  [0/0] {4}                           
     ¦   ¦   °--SYMBOL_FUNCTION_CALL: strsp [0/0] {3}  
     ¦   ¦--'(': ( [0/0] {5}                           
     ¦   ¦--expr:  [0/0] {7}                           
     ¦   ¦   °--STR_CONST: "\n" [0/0] {6}             
     ¦   ¦--',': , [0/1] {8}                           
     ¦   ¦--SYMBOL_SUB: fixed [0/1] {9}                
     ¦   ¦--EQ_SUB: = [0/1] {10}                       
     ¦   ¦--expr:  [0/0] {12}                          
     ¦   ¦   °--NUM_CONST: TRUE [0/0] {11}             
     ¦   °--')': ) [0/0] {13}                          
     ¦--SPECIAL-PIPE: %>% [0/2] {14}                   
     °--expr:  [1/0] {15}                              
         ¦--expr:  [0/0] {17}                          
         ¦   °--SYMBOL: . [0/0] {16}                   
         ¦--LBB: [[ [0/0] {18}                         
         ¦--expr:  [0/0] {20}                          
         ¦   °--NUM_CONST: 1L [0/0] {19}               
         ¦--']': ] [0/0] {21}                          
         °--']': ] [0/0] {22}                          
