However, it should be also stressed that our evaluation was very strict: a retrieved collocate candidate was considered as correct only if it formed a collocation with the base, and if it belonged to the target semantic gloss.
the first condition might be too rigorous, given that, in some cases, there is a margin of doubt whether a combination is a free co-occurrence or a collocation; cf., e.g., huge challenge or reflect [a] concern, which were rejected as collocations in our evaluation.