Exemple #1
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def test2():
    assert first_appear_once("o") == "g"
Exemple #2
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def test6():
    assert first_appear_once("e") == "l"
Exemple #3
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def test1():
    assert first_appear_once("g") == "g"
Exemple #4
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def test5():
    assert first_appear_once("l") == "l"