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export default function computeArea(    ax1: number,    ay1: number,    ax2: number,    ay2: number,    bx1: number,    by1: number,    bx2: number,    by2: number,): number {    const x1 = Math.max(ax1, bx1);    const x2 = Math.min(ax2, bx2);    const y1 = Math.max(ay1, by1);    const y2 = Math.min(ay2, by2);    const allSquare = Math.abs((ax2 - ax1) * (ay2 - ay1)) +        Math.abs((bx2 - bx1) * (by2 - by1));    if (x1 >= x2 || y1 >= y2) {        return allSquare;    }    return allSquare - ((x2 - x1) * (y2 - y1));}