/**
 *
 * @param {number[]} points
 * @param {number} a index of point a
 * @param {number} b index of point b
 * @param {number} c index of point c
 * @param {number} d index of point d
 * @returns {number}
 */
export function orient3d_robust(points: number[], a: number, b: number, c: number, d: number): number;
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