ROOT (token: short_text [lag_newlines/spaces] {pos_id})
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 ¦   ¦   ¦--'(': ( [0/0] {4}                           
 ¦   ¦   ¦--SYMBOL: x [0/1] {5}                        
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 ¦   °--expr:  [0/0] {10}                              
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 ¦       ¦   ¦   °--')': ) [0/0] {22}                  
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     ¦   °--')': ) [0/0] {34}                          
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         ¦--'{': { [0/2] {36}                          
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         °--'}': } [1/0] {50}                          
