Which of the following is/are both sweeter and more deadly than V?

As per question for sweetness,
U is sweeter than V.
1. U > V.
V is sweeter than Y.
2. V > Y.
W is less sweet than X.
3. X > W.
X is less sweet than Y
4. X < Y.
Y is less sweet than U.
5. Y < U.
Z is sweeter than U.
6. Z > U.

From 1 and 2,
7. U > V > Y.
From 6 and 7,
8. Z > U > V > Y.
from 4 and 8,
9. Z > U > V > Y > X
from 3 and 9,
Z > U > V > Y > X > W
Taste (sweet) Z, U, V, Y, X, W == (Z > U > V > Y > X > W)

As per question for deadly,
U is more deadly than Z
1. U > Z.
V is less deadly than Z.
2. V < Z.
W is less deadly than U.
3. W < U.
X is more deadly than Y.
4. X > Y.
Y is more deadly than U.
5. Y > U.
Z is less deadly than W.
6. Z < W.

Now from 1 and 2,
7. U > Z > V
from 7 and 5,
8. Y > U > Z > V
from 4 and 8,
9. X > Y > U > Z > V
from 3, 6 and 9,
X > Y > U > W > Z > V

Effectiveness (deadly) X, Y, U, W, Z, V
It is clear that both Z and U are sweeter and more deadly than V.