def test_lowest_terms_irrational():
    assert (lowest_terms("16/28") == "4/7")
def test_lowest_terms_rational():
    assert (lowest_terms("20/10") == "2/1")
def test_lowest_terms_0():
    assert (lowest_terms("0/12") == "0")
def test_lowest_terms_positive():
    assert (lowest_terms("-12/-26") == "6/13")
def test_lowest_terms_ZeroDivisionError():
    assert (lowest_terms("90/0") == "Undefined")
def test_lowest_terms_irrational_negative_2():
    assert (lowest_terms("-300/165") == "-20/11")
def test_lowest_terms_irrational_negative_1():
    assert (lowest_terms("20/-60") == "-1/3")
def test_lowest_terms_rational_negative():
    assert (lowest_terms("-50/25") == "-2/1")
def test_lowest_terms_gotcha():
	assert(lowest_terms("0/0") == "Undefined")
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def test_lowest_terms_undefined():
    assert (lowest_terms("0/0") == "Undefined")