from typing import Tuple


def _line_to_tuple(line: str) -> Tuple[str, str, str, str]:
    """
    Turn line from verbocean into correct observation

    Parameters
    ----------
    line
        line from verbocean that has to be separated and prepared
    """
    start_br = line.find('[')
    end_br = line.find(']')
    conf_delim = line.find('::')
    verb1 = line[:start_br].strip()
    rel = line[start_br + 1: end_br].strip()
    verb2 = line[end_br + 1: conf_delim].strip()
    conf = line[conf_delim: len(line)].strip()
    return verb1, rel, verb2, conf