ROOT (token: short_text [lag_newlines/spaces] {pos_id})      
 °--expr:  [0/0] {1}                                         
     ¦--expr:  [0/1] {4}                                     
     ¦   °--SYMBOL: mtcar [0/0] {3}                          
     ¦--SPECIAL-PIPE: %>% [0/2] {5}                          
     ¦--expr:  [1/1] {6}                                     
     ¦   ¦--expr:  [0/0] {8}                                 
     ¦   ¦   °--SYMBOL_FUNCTION_CALL: group [0/0] {7}        
     ¦   ¦--'(': ( [0/0] {9}                                 
     ¦   ¦--expr:  [0/0] {11}                                
     ¦   ¦   °--SYMBOL: am [0/0] {10}                        
     ¦   °--')': ) [0/0] {12}                                
     ¦--SPECIAL-PIPE: %>% [0/2] {13}                         
     °--expr:  [1/0] {14}                                    
         ¦--expr:  [0/0] {16}                                
         ¦   °--SYMBOL_FUNCTION_CALL: summa [0/0] {15}       
         ¦--'(': ( [0/4] {17}                                
         ¦--expr:  [1/0] {18}                                
         ¦   ¦--expr:  [0/0] {19}                            
         ¦   ¦   ¦--'!': ! [0/0] {20}                        
         ¦   ¦   °--expr:  [0/0] {21}                        
         ¦   ¦       ¦--'!': ! [0/0] {22}                    
         ¦   ¦       °--expr:  [0/0] {24}                    
         ¦   ¦           °--SYMBOL: mean_ [0/0] {23}         
         ¦   ¦--LEFT_ASSIGN: := [0/0] {25}                   
         ¦   °--expr:  [0/0] {26}                            
         ¦       ¦--expr:  [0/0] {28}                        
         ¦       ¦   °--SYMBOL_FUNCTION_CALL: mean [0/0] {27}
         ¦       ¦--'(': ( [0/0] {29}                        
         ¦       ¦--expr:  [0/0] {31}                        
         ¦       ¦   °--SYMBOL: cyl [0/0] {30}               
         ¦       °--')': ) [0/0] {32}                        
         ¦--',': , [0/4] {33}                                
         ¦--expr:  [1/2] {34}                                
         ¦   ¦--expr:  [0/4] {35}                            
         ¦   ¦   ¦--'!': ! [0/0] {36}                        
         ¦   ¦   °--expr:  [0/0] {37}                        
         ¦   ¦       ¦--'!': ! [0/0] {38}                    
         ¦   ¦       °--expr:  [0/0] {40}                    
         ¦   ¦           °--SYMBOL: count [0/0] {39}         
         ¦   ¦--LEFT_ASSIGN: := [0/0] {41}                   
         ¦   °--expr:  [0/0] {42}                            
         ¦       ¦--expr:  [0/0] {44}                        
         ¦       ¦   °--SYMBOL_FUNCTION_CALL: n [0/0] {43}   
         ¦       ¦--'(': ( [0/0] {45}                        
         ¦       °--')': ) [0/0] {46}                        
         °--')': ) [1/0] {47}                                
