'''
Explain what the following code does: ((n & (n-1)) == 0)

Hints: 151, 202, 261, 302, 346, 372, 383, 398
'''


def debugger(s):
    pass

if __name__ == '__main__':
    assert debugger('') ==
    assert debugger('') ==
    assert debugger('') ==
    assert debugger('') ==
    assert debugger('') ==
