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To be fair they may actually know there stuff but from a didactic point-of-view it is very difficult introduce a `FactoryProvider` (or to a lesser extent even an `HTTPClient`) alongside basic OOP concepts.


Use real useful code example

Have Logger with StdoutLogger as basic example of it

Then FileLogger that extends it with few functions related to files

Then DBLogger with few functions related to logging to database

Then TestLogger for integrating with test framework




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