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