ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 °--expr: c(    [0/0] {1}                              
     ¦--expr: c [0/0] {3}                              
     ¦   °--SYMBOL_FUNCTION_CALL: c [0/0] {2}          
     ¦--'(': ( [0/4] {4}                               
     ¦--expr: 1 [0/0] {6}                              
     ¦   °--NUM_CONST: 1 [0/0] {5}                     
     ¦--',': , [0/7] {7}                               
     ¦--expr: 16 [0/4] {9}                             
     ¦   °--NUM_CONST: 16 [0/0] {8}                    
     ¦--',': , [0/1] {10}                              
     ¦--expr: 333 [0/1] {12}                           
     ¦   °--NUM_CONST: 333 [0/0] {11}                  
     ¦--',': , [0/1] {13}                              
     ¦--expr: 33 [0/1] {15}                            
     ¦   °--NUM_CONST: 33 [0/0] {14}                   
     ¦--',': , [0/2] {16}                              
     ¦--expr: 1 [0/0] {18}                             
     ¦   °--NUM_CONST: 1 [0/0] {17}                    
     °--')': ) [0/0] {19}                              
