function buildTable() {
    // console.log("buildTable")
    const table = document.querySelector("#section_2 .content_container table")

    for (let i = 0; i <= 6; i++) {
        const tr = document.createElement("tr")
        const fieldset = document.createElement("fieldset")
        tr.append(fieldset)
        for (let j = 0; j <= 16; j++) {
            if (i == 0 || j == 0) {
                const th = document.createElement("th")
                const div = document.createElement("div")
                const p = document.createElement("p")
                if (i != 0 && j == 0) {
                    p.textContent = createBinaryString(i + 1, 3)
                } else if (i == 0 && j != 0) {
                    p.textContent = createBinaryString(j - 1, 4)
                } else {
                    p.textContent = ""
                }
                div.append(p)
                th.append(div)
                fieldset.append(th)
            } else {
                const charCode = (i - 1) * 16 + j + 31

                const td = document.createElement("td")
                td.id = `td_${charCode}`
                const div = document.createElement("div")
                const input = document.createElement("input")
                input.type = "radio"
                input.id = `char_${charCode}`
                input.name = `row_${i}`
                input.value = charCode
                // input.tabIndex = 0
                input.dataset.forform = "table_form"
                // input.tabIndex = 0
                if (j == 2) input.setAttribute("checked", "true")
                const label = document.createElement("label")
                label.textContent = i == 6 && j == 16 ? "" : String.fromCharCode(charCode)
                label.setAttribute("for", `char_${charCode}`)
                // label.dataset.edit = "true"
                div.append(input, label)
                td.append(div)
                fieldset.append(td)
            }
        }
        table.append(tr)
    }
}
const createBinaryString = (number, length) => parseInt(number, 10).toString(2).padStart(length, "0")

let previousOutput = [33, 49, 65, 81, 97, 113]
function updateTable(event, form) {
    // console.log("updateTable")
    const data = new FormData(form)
    let output = []
    for (const entry of data) output.push(+entry[1])
    let indexOfChange = 0
    let offset = 0
    output.forEach((row, index) => (row != previousOutput[index] ? (indexOfChange = index) : null))
    output.forEach((row, index) => (index == indexOfChange ? (offset = row - previousOutput[index]) : null))
    output.forEach((row, index) => {
        if (index != indexOfChange) {
            document.forms["table_form"][`char_${row + offset}`].checked = true
            output[index] += offset
        }
    })
    previousOutput = [...output]
    event.preventDefault()
}