import { Step } from './step';
export declare type Key = [number, number, number, number];
export declare const Key: {
    create: (d?: number, x?: number, y?: number, z?: number) => Key;
    parse: (s: string) => Key;
    stringify: (k: Key) => string;
    step: ([d, x, y, z]: Key, [a, b, c]: Step) => Key;
    depth: (k: Key) => number;
};
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