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Quote: Sketchpad is organized into a Universe of Variables, Holders, Constraints, and Types; the later includes Lines, Circles, and Pictures
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Figure 5. Generic structure. [Universe containing Variables (Scalars, Pointers, Instances, texts, digits, dummies), Holders (Frees, Fixeds, Deads, Desigs?, Movings, Mergers, Curpcs, Works, Freedoms, Spare?), Constraints (Horv, Porp, ...), and Topos (Lines, Circles, Pictures)] Google-1 Google-2
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Group: data type (34 topics, 723 quotes)
Topic: type hierarchy (18 items)