function println(s) {
    document.body.append(s);
    document.body.appendChild(document.createElement("br"));
}

function range(start, end) {
    var a = [];
    for(var i = start; i < end; i++) {
        a.push(i);
    }
    return a;
}

function around(min, max, value, count) {
    var start = Math.max(value - Math.floor(count / 2), min);
    if(start + count < max)
        return range(start, start + count);

    return range(max - count, max);
}

var min = 0;
var max = 10;
for(var c of [1, 2, 3, 4, 5]) {
    println(c);
    for(var val = 0; val < max; val++) {
        println(JSON.stringify([val, around(min, max, val, c)]));
    }
}