<Li> "Calypso"--song from The Books of Bokonon . Eight such songs are cited in Cat's Cradle, some of them are presented with a title (e.g. On Dynamic Tension or The Boko - maru Calypso) and others are presented with a number (e.g. The Hundred - and - nineteenth Calypso). The Calypsos illustrate various aspects of the teachings of Bokonon . </Li> <Li> duffle--the destiny of thousands of people placed on one stuppa </Li> <Li> duprass--a karass that consists of only two people . This is one of the few kinds of karass about which one can have any reliable knowledge . The two members of a duprass live lives that revolve around each other, and are therefore often married . "A true duprass can't be invaded, not even by children born of such a union ." The novel cites the example of "Horlick Minton, the New American Ambassador to the Republic of San Lorenzo, and his wife, Claire ." The two members of a duprass always die within a week of each other . </Li> <Li> foma--harmless untruths; lies that, if used correctly, can be useful . </Li>

What is boku-maru and what is its purpose