Question in get_plurals and get_singulars in text normalization of en.
Should both functions be something like `fst @ SINGULAR_TO_PLURAL` instead of `SINGULAR_TO_PLURAL @ fst`? Besides, it seems that these functions are not used actually.

https://github.com/NVIDIA/NeMo/blob/main/nemo_text_processing/text_normalization/en/graph_utils.py#L129

https://github.com/NVIDIA/NeMo/blob/main/nemo_text_processing/text_normalization/en/graph_utils.py#L129