Such corpora are usually called Treebanks or Parsed Corpora. The arteries dilate, filling the "corpus spongiosum" and "corpora cavernosa" with blood. It is diluted with normal saline and injected directly into the corpora cavernosa. This may also become slightly engorged with blood, but less so than the corpora cavernosa. One of the most cited English linguistic corpora is the Penn Treebank. Most frequently used words in different languages based on Wikipedia or combined corpora. Over time, thickened secretions called corpora amylacea accumulate in the gland. The number of corpora lutea increases directly with age. Depending on the corpora used, idioms may not translate "idiomatically". Following is a list of text corpora in various languages. The following are some examples of "hapax legomena" in languages or corpora. The following table lists a selection of biomedical text corpora and their contents. Manatee is a database management system specifically devised for effective indexing of large text corpora. In particular, a number of smaller corpora may be fully parsed. However, for linguists working in the field of corpora, there presents a number of challenges.