 Fission cases come in two varieties: symmetrical and asymmetrical. Examples of symmetrical fission cases include amoebic and hemispheric division [for the latter see Personal Identity below]. In a symmetrical case there is some relation that each of b and c stand in to a, where standing in that relation is what makes each one putatively identical with a. In an asymmetric case, b is putatively identical with a because it stands in a certain relation to a, but c is putatively identical with a because it stands in a different relation to a. The best known example of a symmetrical fission case is the Ship of Theseus described at the beginning of this section.