A very special island is inhabited only by knights and knaves. Knights always tell the truth, and knaves always lie. You meet 6 inhabitants: Aria, Jackson, Ella, Benjamin, Henry, and Samuel. Aria asserted: "Henry is a knave". Jackson noted, "Benjamin is a knight or Henry is a knave". Ella stated, "Jackson is not a knave". According to Benjamin, "Jackson is a knave". Henry said that Samuel is a knave if and only if Aria is a knave. According to Samuel, "Aria is a knave or Henry is a knight". So who is a knight and who is a knave?
Aria is a knight, Jackson is a knight, Ella is a knight, Benjamin is a knave, Henry is a knave, and Samuel is a knave.
(1) Aria is a knight
(2) Jackson is a knight
(3) Ella is a knight
(4) Benjamin is a knave
(5) Henry is a knave
(6) Samuel is a knave
Assume Aria is a knight. No contradiction is found in their claim that Henry is a knave. Henry cannot be a knight, because this would contradict the claim of Aria that Henry is a knave. Assume Henry is a knave. No contradiction is found in their false claim that Samuel is a knave if and only if Aria is a knave. Samuel cannot be a knight, because this would contradict the false claim of Henry that Samuel is a knave if and only if Aria is a knave. Assume Samuel is a knave. No contradiction is found in their false claim that Aria is a knave or Henry is a knight. Assume Jackson is a knight. No contradiction is found in their claim that Benjamin is a knight or Henry is a knave. Benjamin cannot be a knight, because this would contradict the claim of their own that Jackson is a knave. Assume Benjamin is a knave. No contradiction is found in their false claim that Jackson is a knave. Assume Ella is a knight. No contradiction is found in their claim that Jackson is not a knave.