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start with route
/pages, b и c will be preloaded (or with/pages/c/review, module c will be loaded, module b will be preloaded). -
navigate to b: b-index and b-review loaded (not preloaded at the stage 1), b-detail-index will be preloaded.
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go deeper,
pages/b/detail/1/maintenance, b-detail-component and b-maintenance loaded (not preloaded at the previous stages), b-additional will be preloaded.