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var a = 1
var b = 2
assert not a < 2 and (a == b or a > b) # comment 1
assert not a < 2 and (a == b or ((a > b) or a <= b))
assert (a > 2 and b >= 2)
assert (b >= 2)
# comment 3
var c = a + (b - a)
var d = (a - b) + c # comment 4
var e = (-a) # comment 5
var f = -(a - c)