ROOT (token: short_text [lag_newlines/spaces] {pos_id})
 ¦--COMMENT: #A co [0/0] {1}                           
 ¦--COMMENT: #!/us [1/0] {2}                           
 ¦--COMMENT: #!/us [1/0] {3}                           
 ¦--expr: a <-  [1/0] {4}                              
 ¦   ¦--expr: a [0/1] {6}                              
 ¦   ¦   °--SYMBOL: a [0/0] {5}                        
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {7}                      
 ¦   °--expr: 3 [0/0] {9}                              
 ¦       °--NUM_CONST: 3 [0/0] {8}                     
 ¦--COMMENT: #!/us [2/0] {10}                          
 ¦--expr: dd <- [1/0] {11}                             
 ¦   ¦--expr: dd [0/1] {13}                            
 ¦   ¦   °--SYMBOL: dd [0/0] {12}                      
 ¦   ¦--LEFT_ASSIGN: <- [0/1] {14}                     
 ¦   °--expr: 33 [0/0] {16}                            
 ¦       °--NUM_CONST: 33 [0/0] {15}                   
 ¦--COMMENT: #!/us [1/0] {17}                          
 ¦--expr: c() [1/0] {18}                               
 ¦   ¦--expr: c [0/0] {20}                             
 ¦   ¦   °--SYMBOL_FUNCTION_CALL: c [0/0] {19}         
 ¦   ¦--'(': ( [0/0] {21}                              
 ¦   °--')': ) [0/0] {22}                              
 °--COMMENT: #!NEE [1/0] {23}                          
