ImgCanvas(jigsawInfo.back);
                const [frontCanvasForDebug, frontContextForDebug] = await createImgCanvas(jigsawInfo.front);
                const [backCanvasForDebug, backContextForDebug] = await createImgCanvas(jigsawInfo.back);
                const canvasBox = document.getElementById("canvasBox");
                for (let child of Array.from(canvasBox.children)) {
                    canvasBox.removeChild(child);
                }
                canvasBox.appendChild(frontCanvasForDebug);
 