I want to know the answer to the following question:
In which year did Popper write Hayek a letter expressing his intellectual debt to him?
All the background I'm provided with is that "In a letter to Hayek in 1944, Popper stated, "I think I have learnt more from you than from any other living thinker, except perhaps Alfred Tarski."". Is that enough to answer the question?
Answer: yes