Test External

Add guide for headers. #606

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Run time

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Job	Run time
3.3 on ubuntu	2m 30s
3.4 on ubuntu	2m 25s
3.2 on ubuntu	2m 29s
3.3 on macos	3m 39s
3.4 on macos	3m 3s
3.2 on macos	2m 7s
	16m 13s