A conversation between User and Assistant. The user asks a question, and the Assistant solves it. The assistant first thinks about the reasoning process in the mind and then provides the user with the answer.
User: A very special island is inhabited only by knights and knaves. Knights always tell the truth, and knaves always lie. You meet 5 inhabitants: Evelyn, Oliver, Scarlett, Ella, and Sebastian. "Scarlett is a knave or Scarlett is a knight," Evelyn mentioned. As Oliver put it, "Ella is a knight". According to Scarlett, "Sebastian is a knight or Ella is a knight". According to Ella, "Oliver is a knight if and only if Ella is a knight". Sebastian asserted: "Scarlett is a knight if and only if Oliver is a knight". So who is a knight and who is a knave? Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags, for example <answer> (1) Zoey is a knight
(2) Oliver is a knight
(3)... </answer>.
Assistant: Let me solve this step by step.
<think> 
user
Assume Evelyn is a knight.  No contradiction is found in their claim that Scarlett is a knave or Scarlett is a knight.
 Assume Scarlett is a knight.  No contradiction is found in their claim that Sebastian is a knight or Ella is a knight.
 Assume Sebastian is a knight.  No contradiction is found in their claim that Scarlett is a knight if and only if Oliver is a knight.
 Assume Oliver is a knight.  No contradiction is found in their claim that Ella is a knight.
 Assume Ella is a knight.  No contradiction is found in their claim that Oliver is a knight if and only if Ella is a knight.
 Therefore, (1) Evelyn is a knight
 (2) Oliver is a knight
 (3) Scarlett is a knight
 (4) Ella is a knight
 (5) Sebastian is a knight
A conversation between User and Assistant. The user asks a question, and the Assistant solves it. The assistant first thinks about the reasoning process in the mind and then provides the user with the answer.
User: A very special island is inhabited only by knights and knaves. Knights always tell the truth, and knaves always lie. You meet 5 inhabitants: Evelyn, Oliver, Scarlett, Ella, and Sebastian. "Scarlett is a knave or Scarlett is a knight," Evelyn mentioned. As Oliver put it, "Ella is a knight". According to Scarlett, "Sebastian is a knight or Ella is a knight". According to Ella, "Oliver is a knight if and only if Ella is a knight". Sebastian asserted: "Scarlett is a knight if and only if Oliver is a knight". So who is a knight and who is a knave? Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags, for example <answer> (1) Zoey is a knight
(2) Oliver is a knight
(3)... </answer>.
Assistant: Let me solve this step by step.
<think> 
Assume Evelyn is a knight. No contradiction is found in their claim that Scarlett is a knave or Scarlett is a knight.
Assume Scarlett is a knight. No contradiction is found in their claim that Sebastian is a knight or Ella is a knight.
Assume Sebastian is a knight. No contradiction is found in their claim that Scarlett is a knight if and only if Oliver is a knight.
Assume Oliver is a knight. No contradiction is found in their claim that Ella is a knight.
Assume Ella is a knight. No contradiction is found in their claim that Oliver is a knight if and only if Ella is a knight.
Therefore, (1) Evelyn is a knight
(2) Oliver is a knight
(3) Scarlett is a knight
(4) Ella is a knight
(5) Sebastian is a knight </think>
<answer> (1) Evelyn is a knight
(2) Oliver is a knight
(3) Scarlett is a knight
(4) Ella is a knight
(5) Sebastian is a knight </answer>
Evelyn Oliver Scarlett Ella Sebastian
(1) Evelyn is a knight
(2) Oliver is a knight
(3) Scarlett is a knight
(4) Ella is a knight
(5) Sebastian is a knight
(('or', ('lying', 2), ('telling-truth', 2)), ('telling-truth', 3), ('or', ('telling-truth', 4), ('telling-truth', 3)), ('<=>', ('telling-truth', 1), ('telling-truth', 3)), ('<=>', ('telling-truth', 2), ('telling-truth', 1)))
rule