Comment by Aivean

Hosted demo, "Logic puzzle" example: "On a shelf, there are five books: a gray book, a red book, a purple book, a blue book, and a black book. The red book is to the right of the gray book. The black book is to the left of the blue book. The blue book is to the left of the gray book. The purple book is the second from the right.

Which book is the leftmost book?"

Answer: > The black book

Same puzzle with the question "Which book is the rightmost book?"

Answer: > The black book

I tried to ask GPT-3 and Codex this problem, they could not solve it either.