In the semantic odd man out (SOMO) task, we modified sentences by replacing a random noun or verb o with another noun or verb r. To make the task more challenging, the bigrams formed by the replacement with the previous and following words in the sentence have frequencies that are comparable (on a log-scale) with those of the original bigrams.
if the original sentence contains bigrams w n−1 o and ow n+1 , the corresponding bigrams w n−1 r and rw n+1 in the modified sentence will have comparable corpus frequencies.