These include online dictionaries, online bilingual concordances, spell checking and conjugation tools. Despite the concordances between these manuscripts, the collection includes many variants. Concordances are frequently used in linguistics, when studying a text. Online bitexts and translation memories may also be called online bilingual concordances. See the use of such concordances in Sakayan's textbooks. A predecessor concept was used in creating some concordances. The concordances for "cognitive disorder" were 91% and 30% respectively. Michael Chidester has provided extensive concordances of a number of manual groups on the Wiktenauer. In pre-computer times, concordances to important books were manually assembled. Due to Strong's numbers it became possible to translate concordances from one language into another.