To estimate precision, 100 relation instances were randomly sampled from each of four sections of the ranks of the acquired instances for each of the two relations (1-500, 501-1500, 1501-3500 and 3500-7500), and the correctness of each sampled instance was judged by two graduate students (i.e.
additionally, the number of seed instances affects the precision of both higher-ranked and lower-ranked instances.