예제 #1
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def test_0():
    assert countX("xxhixx") == 4
예제 #2
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def test_6():
    assert countX("hihi") == 0
예제 #3
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def test_5():
    assert countX("") == 0
예제 #4
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def test_4():
    assert countX("x") == 1
예제 #5
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def test_3():
    assert countX("h") == 0
예제 #6
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def test_2():
    assert countX("hi") == 0