Update README.md

README.md

@@ -330,7 +330,7 @@ An example of 'train' looks as follows:
 - `tags`: the list of tags of this sentence marking a token as being outside a key phrase, or being part of a material, process or task, a `list` of classification labels.
 
 ```python
-{"O": 0, "M": 1, "P": 2, "P": 3}
+{"O": 0, "M": 1, "P": 2, "T": 3}
 ```
 
 #### subtask_c