def test_compressed():
uncompressed = ['L', 'L', 'B', 'Bi', 'Li', 'Ui', 'U', 'R']
expected = ['L', 'R']
assert compressed(uncompressed) == expected
def test_compressed3():
uncompressed = ['Ri', 'Ri']
expected = ['Ri', 'Ri']
assert compressed(uncompressed) == expected
