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The main difference is that we do not have extension over all sets. We also present an example of Shelah showing that extension over all sets may not hold for any dependence relation for superstable homogeneous models.<\/jats:p>","DOI":"10.2178\/jsl\/1190150294","type":"journal-article","created":{"date-parts":[[2007,12,13]],"date-time":"2007-12-13T19:16:54Z","timestamp":1197573414000},"page":"1469-1482","source":"Crossref","is-referenced-by-count":16,"title":["A rank for the class of elementary submodels of a superstable homogeneous 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