/**
 * Implementation of Combinations
 * Combinations are unique subsets of a collection - in this case, k x from a collection at a time.
 * https://en.wikipedia.org/wiki/Combination
 * @param {Array} x any type of data
 * @param {int} k the number of objects in each group (without replacement)
 * @returns {Array<Array>} array of permutations
 * @example
 * combinations([1, 2, 3], 2); // => [[1,2], [1,3], [2,3]]
 */
declare function getCombinations(x: any, k: any): any;
export default getCombinations;