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If A, then B
A → B
Contrapositive of A → B
-B → - A
All C are D
C → D
Every E is F
E → F
If G, then not H
G → -H
No I are J
I → -J
Only K are L
L → K
M only if N
M → N
The only O are P
O → P
No Q unless R
Q → R
S unless T
-S → T
No U without V
U → V
Without W, no X
X → W
Y if, but only if Z
Y → Z AND Z → Y
A if, and only if, B
A → B AND B → A
C if D
D → C
E is always F
E → F
All A are B (contrapositive)
-B → - A
No C are D
D → -C
If G, neither H nor I
H or I → -G
If J or K, no L
L → -J and -K