Eventually, by the help of the people—old and young, for all became interested in the work—we were able to collect close upon seven thousand root words which, with their derivatives, give us a vocabulary of nearly forty thousand words. These derivatives are produced by very regular rules, which when once understood, the learner possesses the key to a large treasury of words, e.g.: Verb. _Tula._ To do smithing. Der. Noun. _Motuli._ A smith. Der. Noun. _Motuliji._ One who causes the smithing to be done, a master. Der. Noun. _Motuleliji._ One who causes smithing to be done for another, a foreman. Der. Noun. _Ntula._ The smithing peculiar to one smith, as distinct from that of another smith—his mode of smithing. Der. Noun. _Lituli._ The kind of smithing needed by one article as distinct from that required by another. Der. Noun. _Botula._ Skill or ability in smithing. Der. Noun. _Etuli._ The article worked upon. Der. Noun. _Etulela._ Habit of smithing. Der. Noun. _Etuleli._ Instrument with which to do smithing. Der. Noun. _Motula._ A smithing, e.g. _Atuli motula_, literally, he smiths a smithing, i.e. he works at smithing. Der. Noun. _Litulele._ A place for smithing = a workshop, smithy. Der. Noun. _Motuleli._ One who does smithing for another, an employee at smithing. Another set of derivatives is made from the reversive form of the word, as _kanga_ = to tie, _mokangi_ = a tier, _kangola_ = to untie, _mokangoli_ = an untier; and this reversive form can give us derivatives built on its idea, as from _kangolela_ = to untie for another, comes _mokangoleli_ = one who unties for another; and from the causative _kangolija_ = to cause to untie, comes _mokangoliji_ = one who causes to untie; and, again, from the causative of its prepositional form _kangolelija_ = to cause to untie something for someone, comes _mokangoleliji_ = one who causes a person to untie something for or on behalf of another.