The code demonstrates 3 different ways to create and run a thread in a PyQt5 application.

1. Subclassing `QThread`: `AThread` is a subclass of `QThread`. It overrides the `run()` method to print "A Increasing" every second for 5 times.

2. Subclassing `QObject` and using `moveToThread`: `SomeObject` is a subclass of `QObject` and has a finished signal. It has a `long_running` method that prints "B Increasing" every second for 5 times and emits the finished signal after the loop is done. The object is moved to a separate thread using `moveToThread` method. When the thread starts, it runs the `long_running` method.

3. Using a `QRunnable`: `Runnable` is a `QRunnable` class. It has a run method that prints "C Increasing" every second for 5 times. The run method is added to a thread pool, which will create a new thread and run the method.

Each of these 3 ways is demonstrated in a separate function. To run each of them, uncomment the corresponding function in the `main` section and comment out the other two.
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