2020/06.py
def part1():
    """
    This part is just a sum of the number of letters in the *union* of all of the
    responses for each group.
    """
    return sum(len(set.union(*g)) for g in groups)

    This part is just a sum of the number of letters in the *union* of all of the
    responses for each group.
    
This part is just a sum of the number of letters in the *union* of all of the
responses for each group.
This part is just a sum of the number of letters in the * union * of all of the responses for each group .
def part1():
    return sum(len(set.union(*g)) for g in groups)
def part1 ( ) : return sum ( len ( set . union ( * g ) ) for g in groups )
This part is just a sum of the number of letters in the *union* of all of the
responses for each group.
This part is just a sum of the number of letters in the * union * of all of the responses for each group .
"""
    This part is just a sum of the number of letters in the *union* of all of the
    responses for each group.
    """