"Contained each" can be replaced by a variety of synonyms depending on the context. For example, "contained in" or "enclosed within" can suggest items or information that are physically or metaphorically inside something else. "Contained together" may imply that the items are grouped or organized within the same space. Other synonyms might include "contained within one another," suggesting a layered or nested arrangement. Alternatively, "contained comprehensively" may denote full and complete coverage or inclusion of all relevant elements or aspects. Ultimately, the synonym chosen will depend on the author's intended meaning and the broader context of the sentence or passage.