Representations of alternating group of degree 4 #260

Job	Run time
Julia lts - macOS-latest - pull_request	10m 34s
Julia lts - ubuntu-latest - pull_request	9m 21s
Julia 1 - ubuntu-latest - pull_request	15m 45s
Julia 1 - macOS-latest - pull_request	13m 59s
Julia 1 - windows-latest - pull_request	19m 31s
Julia lts - windows-latest - pull_request	11m 15s
	1h 20m 25s

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