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Background: We merge separate spans that cover a continuous logical span of text. E.g: [(0, 17), (17, 35)] -> [(0, 35)]
Previously we sometimes encountered negative span annotations like this one: (208, 147). This was caused by incorrect merging of adjacent annotations. Instead of filtering the end positions using the original start positions we filtered using the already filtered start positions. As a result no end positions were ever removed, meaning the function produced two lists of different lengths, the longer of which (with the end positions) was truncated by the call to zip.