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The data contained in this document may not be modified in any way. Cost estimates described or summarized in this document were generated as part of a preliminary concept study, are model-based, assume a JPL in-house build, and do not constitute a commitment on the part of JPL or Caltech. References to work months, work years, or FTEs generally combine(More)
Activity plays an important role in human life. Psychology as scientific discipline knows several categories of activities, motivations to activity, their characteristics etc. A significant group of these activities expects some cognitions, knowledge and skills. We identify particular relations, arrangement respectively event hierarchy, which is represented(More)
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