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Add histograms invisibly (#314) #122

Job	Run time
build-and-push-image	46s
lint	21s
list-e2e-tests	7s
build-frontend	1m 48s
run-e2e-tests (./statistics_test.js)	1m 41s
run-e2e-tests (./mapper_test.js)	1m 25s
run-e2e-tests (./settings_test.js)	1m 25s
run-e2e-tests (./random_test.js)	1m 10s
run-e2e-tests (./string_check_test.js)	1m 7s
run-e2e-tests (./quiz_test.js)	3m 11s
run-e2e-tests (./article_test.js)	2m 56s
run-e2e-tests (./search_test.js)	1m 27s
run-e2e-tests (./comparison_test.js)	1m 42s
	19m 6s

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