Illustrative hierarchy. Rows and boxes are visited in order; values are not evaluated.

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Structural exploration

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Mixed collections Structured data diagram with 10 values in 4 containers. Rows show members in source order and arrays show positions; connectors join nested containers. Mixed collections settings {…} routes […] limits {soft: 20, hard: 100} regions […] notes First line Second line [0] east [1] west [0] [api, worker] [1] [worker, store]