       }
                    // end
                }
            }

            document.getElementById("openJigsawJson").onchange = event => {
                if (event.target.files && event.target.files[0] && event.target.files[0].type === "application/json") {
                    const fileReader = new FileReader();
                    fileReader.onload = (err, res) => {
                        const info = JSON.parse(fileReader.result);
                        analysis(info);
                    };
   