helsinki_models = [
  "Helsinki-NLP/opus-mt-tc-big-itc-eu",
  "Helsinki-NLP/opus-mt-tc-big-eu-itc",
  "Helsinki-NLP/opus-mt-euq-en",
  "Helsinki-NLP/opus-mt-eu-ru",
  "Helsinki-NLP/opus-mt-eu-es",
  "Helsinki-NLP/opus-mt-eu-en",
  "Helsinki-NLP/opus-mt-eu-de",
  "Helsinki-NLP/opus-mt-en-euq",
  "Helsinki-NLP/opus-mt-en-euq",
  "Helsinki-NLP/opus-mt-en-eu",
  "Helsinki-NLP/opus-mt-de-eu",
  "Helsinki-NLP/opus-mt-ru-eu",
  "Helsinki-NLP/opus-mt-es-eu",
]

def get_clearly_formatted_language_directions():
    # Clearly formatted language directions only
    # Helsinki-NLP/opus-mt-tc-base-bat-zle is ignored
    # Helsinki-NLP/opus-mt-tc-fr-en is accepted due to clarity of source language being fr and target language being en
    language_directions = [model.split("Helsinki-NLP/opus-mt-")[1] for model in helsinki_models 
                           if (len(model.split("-"))<6 and 
                               "opus-mt" in model and 
                               len(model.split("_")) == 1)
                               and len(model) < len("Helsinki-NLP/opus-mt-src-trg")]
    return language_directions