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x = y = z = 1
# these should match
_ = x == y and x == z
_ = x == y and y == z
_ = x == y and z == y
_ = x == y and x == z and True
_ = x == y and y == z and z == 1
_ = x == y and z == x
_ = x is None and y is None
_ = x is None and None is y
_ = None is x and y is None
_ = x is None and y is None and True
# these should not
_ = x == y and z == 1
_ = x == y or 1 == z
_ = x == y or 1 == z
_ = x == y or x <= z
_ = x is None and y is 1
_ = x is None or y is None
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