export declare class Pair<A, B> {
    x: A;
    y: B;
    constructor(x: A, y: B);
    toKey(): string;
    equals(other: Pair<A, B>): boolean;
    static fromKey<A, B>(key: string): Pair<A, B>;
    static key<X, Y>(x: X, y: Y): string;
}
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