/**
 * Every stemma a handful of copies can stand in: rooted trees whose
 * nodes are versions, a copy carrying any of them, a lost one above
 * any two or more.
 */
/**
 * A node of a stemma: the copy carrying it at first hand, by its number,
 * or none for a lost state, and the nodes derived from it.
 */
export interface StemmaNode {
    readonly copy?: number;
    readonly children: readonly StemmaNode[];
}
/**
 * Every stemma of n copies: 3 for two copies, 91,984 for six. They are
 * produced one by one, so that only the leaf trees, far fewer, are held.
 */
export declare function stemmataOf(n: number): Generator<StemmaNode>;
/** How many stemmata the exhaustive search scores, at most. */
export declare const MAX_COPIES = 7;