any further determination through the use of an article). As a statistical change within a language within any century, rebracketing is a very weak statistical phenomenon. Even during phonetic template shifts, it is at best only probable that 0.1% of the vocabulary may be rebracketed in any given century. Rebracketing is part of the process of language change, and often operates together with sound changes that facilitate the new etymology. Rebracketing is sometimes used for jocular purposes, for example psychotherapist can be rebracketed jocularly as Psycho the rapist, and together in trouble can be rebracketed jocularly as to get her in trouble. Role in forming new words Before the increased standardization of the English language in the modern period, many new words entered its lexicon in exactly the way just described. A 15th century English cook may once have said something like: "Ah, I found this ewt and this nadder in my napron while baking numble-pie." A few generations later the cook's descendant would have said: "Ah, I found this newt and this adder in my apron while baking (h)umble-pie." Over the course of time these words were misheard and resegmented: ewt became newt, nadder became adder, napron became apron, numble-pie became (h)umble pie. The force behind these particular resegmentations, and by far the most powerful force behind any such resegmentations in the English language, was the "movable-n" of the indefinite article a(n), of the possessive pronouns my(n) and thy(n), and of the old dative case of the definite article the(n). The biforms no/none, the prepositions in and on, the conditional conjunction an even, the shortened form n (and), and the inflectional endings in -n may also have played a part. Through the process of prothesis, in which the sound at the end of a word is transferred to the beginning of the word following, or conversely aphaeresis, in which the sound at the beginning of a word is transferred to the end of the word preceding, old words were resegmented and new words formed. So through prothesis an ewt became a newt. Conversely through aphaeresis a nadder became an adder, a napron became an apron, and a numble-pie became an (h)umble-pie. Many other words in the English language owe their existence to just this type of resegmentation: e.g., nickname, ninny, namby-pamby, nidiot/nidget, nonce word, nother, and notch through prothesis of n; auger, umpire, orange, eyas, atomy, emony, ouch, and