HARK build on MacOS, Ubuntu and Windows

Edits to improve comprehensibility of SSJ_example #2818

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Run time

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Job	Run time
build (ubuntu-latest, 3.10)	8m 42s
build (ubuntu-latest, 3.11)	8m 50s
build (ubuntu-latest, 3.12)	9m 2s
build (macos-latest, 3.10)	9m 21s
build (macos-latest, 3.11)	10m 47s
build (macos-latest, 3.12)	9m 6s
build (windows-latest, 3.10)	12m 50s
build (windows-latest, 3.11)	11m 34s
build (windows-latest, 3.12)	10m 38s
	1h 30m 50s