CODE SHOULD BE IN PYTHON it should pass this test case: e = ('*', ('+', 'x', 2), ('/', 'x', 'yay')) assert variables(e) == {'x', 'yay'}
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def variables(e):
e = ('*', ('+', 'x', 2), ('/', 'x', 'yay'));
assert variables(e) == {'x', 'yay'};
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