solution.py

# A population of bears consists of black bears, brown bears, and white bears.

# The input is an array of two elements.

# Determine whether the offspring of the two bears will return 'black', 'brown', 'white', 'dark brown', 'grey',
# 'light brown', or 'unknown'.
# Elements in the the array will always be a string.

# Examples:
# bear_fur(['black', 'black'])  returns 'black'
# bear_fur(['brown', 'brown'])  returns 'brown'
# bear_fur(['white', 'white'])  returns 'white'
# bear_fur(['black', 'brown'])  returns 'dark brown'
# bear_fur(['black', 'white'])  returns 'grey'
# bear_fur(['brown', 'white'])  returns 'light brown'
# bear_fur(['yellow', 'magenta'])  returns 'unknown'


def bear_fur(bears):
    return {
        ('black', 'black'): 'black',
        ('brown', 'brown'): 'brown',
        ('white', 'white'): 'white',
        ('black', 'brown'): 'dark brown',
        ('black', 'white'): 'grey',
        ('brown', 'white'): 'light brown',
    }.get(tuple(sorted((bears))), 'unknown')