CLHS: Section 19.2.2.4.3.1

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## 19.2.2.4.3.1 Directory Components in Non-Hierarchical File Systems

In non-hierarchical file systems, the only valid list values for the directory component of a pathname are `(:absolute` string`)` and `(:absolute :wild)`. `:relative` directories and the keywords `:wild-inferiors`, `:up`, and `:back` are not used in non-hierarchical file systems.

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