<user>
A: D is a truth-teller.
B: A is a truth-teller if and only if C is a liar.
C: A is a truth-teller if and only if D is a liar.
D: If C is a truth-teller, then A is a liar.
</user>
<assistant>
REASONING:
...

CONCLUSION:
A: truth-teller
B: truth-teller
C: liar
D: truth-teller
</assistant>
---
<user>
A: If D is a liar, then C is a liar.
B: D is a truth-teller and C is a liar.
C: If D is a liar, then B is a liar.
D: If A is a truth-teller, then C is a truth-teller.
</user>
<assistant>
REASONING:
...

CONCLUSION:
A: truth-teller
B: liar
C: truth-teller
D: truth-teller
</assistant>
---
<user>
A: If B is a truth-teller, then D is a truth-teller.
B: A is a liar and C is a truth-teller.
C: A is a truth-teller if and only if B is a liar.
D: A is a liar.
</user>
<assistant>
REASONING:
...

CONCLUSION:
A: truth-teller
B: liar
C: truth-teller
D: liar
</assistant>
---
<user>
A: C is a truth-teller.
B: If C is a liar, then A is a truth-teller.
C: If B is a truth-teller, then A is a truth-teller.
D: A is a truth-teller if and only if B is a liar.
</user>
<assistant>
REASONING:
...

CONCLUSION:
A: truth-teller
B: truth-teller
C: truth-teller
D: liar
</assistant>
---
<user>
A: B is a truth-teller if and only if D is a liar.
B: D is a truth-teller and C is a liar.
C: B is a truth-teller.
D: A is a truth-teller and B is a truth-teller.
</user>
<assistant>
REASONING:
...

CONCLUSION:
A: liar
B: liar
C: liar
D: liar
</assistant>
---
<user>
A: D is a truth-teller and B is a liar.
B: If A is a liar, then D is a truth-teller.
C: A is a liar and B is a liar.
D: A is a liar.
</user>
<assistant>
REASONING:
...

CONCLUSION:
A: liar
B: truth-teller
C: liar
D: truth-teller
</assistant>
---
<user>
A: If D is a liar, then C is a liar.
B: D is a liar if and only if A is a truth-teller.
C: D is a truth-teller.
D: If C is a liar, then A is a truth-teller.
</user>
<assistant>
REASONING:
...

CONCLUSION:
A: truth-teller
B: liar
C: truth-teller
D: truth-teller
</assistant>
---
<user>
A: If D is a truth-teller, then B is a truth-teller.
B: A is a liar if and only if C is a liar.
C: A is a liar if and only if B is a liar.
D: If A is a liar, then C is a liar.
</user>
<assistant>
REASONING:
...

CONCLUSION:
A: truth-teller
B: truth-teller
C: truth-teller
D: truth-teller
</assistant>
