Some Type one NACT groups like the Comanche and Navajo also developed alphabet systems, using the first letter of English words translated from Native words to spell out names of individuals and locations. For example, the translation of the Comanche words for pear, ant, rain, ice and snake could be combined to convey “Paris.” While the Comanche used an open system by using any word that translated to the desired letter, the Navajo developed a set vocabulary, such as “wol-la-chee” (ant) for the letter a, “shush” (bear) for b, “moasi” (cat) for c and so on. Later they developed three interchangeable words for each English letter. Both systems prevented repetition and inhibited breaking of the code.