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    Variable searchableQueryProblemConst

    searchableQueryProblem: Problem<string>

    A query the tokenizer can use. A blank query means "every record"; a non-blank one with no term left after tokenising ("???", "a", "-") is not the same thing, and answering it with every record is the silently-dropped constraint a blank filter is refused to prevent. A query of only exclusions (-radwege) keeps its terms and passes.