design
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stop watch 19.Tax (polymorphism)
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account undo 20. save
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DbCommand,DdConnection
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Flow Chart Traversal
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Rule Engine
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Invoice TaxType . - 1
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AccountType - multi dimension - 2
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Stack, List, Queue
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SADlg, CADlg, SADao,CADao
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Account Enrichment
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Stock Broker
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JobHandler
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GameObject
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Extendable Family
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Log library
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Statemachine
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clone
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student course
Vertical and Horizontal: Two Approaches to the Decorator Pattern