def _check_elementary_axis_name(name: str) -> bool:
    """
    Valid elementary axes contain only lower latin letters and digits and start with a letter.
    """
    if len(name) == 0:
        return False
    if not 'a' <= name[0] <= 'z':
        return False
    for letter in name:
        if (not letter.isdigit()) and not ('a' <= letter <= 'z'):
            return False
    return True
def _check_elementary_axis_name ( name : str ) -> bool : if len ( name ) == 0 : return False if not 'a' <= name [ 0 ] <= 'z' : return False for letter in name : if ( not letter . isdigit ( ) ) and not ( 'a' <= letter <= 'z' ) : return False return True
Valid elementary axes contain only lower latin letters and digits and start with a letter.