a = 3 + 4 * 5
b = (3 + 4) * 5

c = 2 ^ 3 ^ 2
d = (2 ^ 3) ^ 2

e = -a + b
f = !a

r = a < b
r = a <= b
r = a > b
r = a >= b

s = a == b
s = a != b

s = a + b * c - d / e % 2
s = (a + b) * (c - d) / 3

t = a && b
t = a || b
t = (a < b) && (c > d)
t = (a == b) || (c != d)

s = !(a + b < c * d)
t = -(-a + b * -(c + d))