Compare x - y & y - z
1. x > z, we don't know about y
eg. x = 2, y = 3, z = 1 --> -1 < 2 but if x = 2, y = -3, z = 1 --> 5 > -4. Hence insuf
2. z > y --> y - z < 0. We're not sure x - y < 0 or > 0
Combine: x > z > y --> x - y > y - z
1. x > z, we don't know about y
eg. x = 2, y = 3, z = 1 --> -1 < 2 but if x = 2, y = -3, z = 1 --> 5 > -4. Hence insuf
2. z > y --> y - z < 0. We're not sure x - y < 0 or > 0
Combine: x > z > y --> x - y > y - z
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