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| def is_surprising(seq, d): | |
| subseq = set() | |
| collisions = 0 | |
| for i in range(0, len(seq)-d-1): | |
| word = (seq[i], seq[i+d+1]) | |
| if word in subseq: | |
| collisions += 1 | |
| else: | |
| subseq.add(word) | |
| return collisions |
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