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static LS simpleWikipedia_allCachedTopics() { new LS topics; for (File f : listFilesWithExtension(simpleWikipedia_cacheDir(), ".infos")) { File f2 = fileInSameDir(f, dropSuffixIC(".infos", f.getName())); addIfNotNull(topics, getFileInfoField(f2, "Topic")); } ret topics; }