def divisible_by_7(n: int) -> list[int]:
    """
    Returns a list of all numbers till 'n' that are divisible by '7'
    """


def contains_3(n: int) -> list[int]:
    """
    Returns a list of all numbers that contain the digit '3' in them
    """


def count_spaces(string: str) -> int:
    """
    Count the spaces in a string
    """


def remove_vowels(string: str) -> str:
    """
    Remove all vowels from the string
    """


def word_lengths(string: str) -> dict[str, int]:
    """
    Create a dictionary of all words with their lengths
    """


def prime_numbers(n: int) -> list[int]:
    """
    Returns a list of all prime numbers till 'n' (HARD)
    """