export declare function normalizeBody(body: string): string;
export declare function bigramTokens(normalized: string): Set<string>;
export interface PreparedBody {
    readonly normalized: string;
    readonly tokens: ReadonlySet<string>;
}
export declare function prepareBody(body: string): PreparedBody;
export declare function jaccardSimilarityPrepared(a: PreparedBody, b: PreparedBody): number;
export declare function jaccardSimilarity(a: string, b: string): number;
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