process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function main() {
    var q = parseInt(readLine());
    for(var a0 = 0; a0 < q; a0++){
        var len_temp = readLine().split(' ');
        var len = parseInt(len_temp[0]);
        var c = parseInt(len_temp[1]);
        // your code goes here
        if (c > (len * (len - 1) / 2 )) {
            console.log("-1");
            continue;
        }
        
        if (c == (len * (len - 1) / 2 )) {
            var r = [];
            for (var i = len; i > 0; i--) r.push(i); 
            console.log(r.join(" "));
            continue;
        }
        
        var r = [];
        var tmp = 0;
        for (var i = 1; i <= len; i++) r.push(i);
        for (i = 0; i < (len * (len - 1) / 2 ) - c; i++) {
            tmp = r[len-1-i];
            r[len-1-i] = r[i];
            r[i] = tmp;
        }
        console.log(r.join(" "));
        
    }

}