change `ef_` objects to `efk_` #13

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Run time

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Job	Run time
macos-latest (release)	6m 32s
windows-latest (release)	5m 27s
ubuntu-latest (devel)	3m 0s
ubuntu-latest (release)	2m 35s
ubuntu-latest (oldrel-1)	3m 36s
	21m 10s