Q: This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
Meanwhile, the USSR continued briefly trying to perfect their N1 rocket, finally canceling it in 1976, after two more launch failures in 1971 and 1972.
A:
Which year did the USSR cancel the N1 rocket program after two failures that didn't launch?