/**
 * method to separate bits from a given integer 2 positions apart
 *
 * @example when input is ABC, output bits are 0A0B0C
 * @see https://github.com/Forceflow/libmorton/blob/234a443ca8e2c64f6385f1a9d6ee10a70d08a3fa/include/libmorton/morton2D.h#L99
 * @param {number} a
 * @returns {number}
 */
export function split_by_2(a: number): number;
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