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iamtakingiteasy
...
headwear
> helmet
> > blue
vs
...
headwear
> blue
Например. Сложнее будет менежить и достигать оптимального варианта детализации.
До некоторой степени этот юзкейз, по крайней мере для поиска, решается импликациями, но даже их оказывается затруднительно поддерживать.