This situation is illustrated here in terms of various collocations and proper idioms. In computational linguistics, PMI has been used for finding collocations and associations between words. Detailed attention is given to variant forms, collocations, and etymology. Shakespeare derived from "Holinshed's Chronicles" certain verbal collocations and points of action. Simple collocations (i.e. the co-occurrence of certain words) demonstrate well the catena concept. This would seem to indicate liaison is primarily active in high-frequency word associations (collocations). There are many different types of collocations. It is not always simple to detach collocations and compounds. A decision list algorithm is then used to identify other reliable collocations. The algorithm will continue to iterate until no more reliable collocations are found. When the rules outlined above are in contradiction, typical collocations usually prevail. However, the two words are also used independently of the above in collocations. Smith's large scale installations, Collocations, were an evolution of the Volume series.