/**
 * Generate all combinations of choosing k items from n items as an iterator.
 * Useful for large combination sets to avoid storing all combinations in memory.
 * @param n - total number of items.
 * @param k - number of items to choose.
 * @yields Each combination as an array of indices.
 */
export declare function getCombinationsIterator(n: number, k: number): Generator<number[], void, undefined>;
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