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Get each sample as `Solution` from `SampleSet` #1368

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Run time

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Job	Run time
protogen	2m 54s
stub-gen	39s
ruff	21s
test (3.9)	4m 20s
test (3.10)	4m 22s
test (3.11)	3m 25s
test (3.12)	3m 13s
	19m 14s