SoftUni Couples Frequency

function solve(args) {
    var count = 0;
    var matrix = {};

    for (var i = 0; i < args.length - 1 ; i++) {

        var couple = args[i] + args[i + 1];

        for (var j = 0; j < args.length - 1; j++) {
            var testCouple = args[j] + args[j + 1];
            if (couple === testCouple) {
                count++;
            }
        }
            matrix[couple] = count;
            count = 0;
    }

    console.log(matrix);
}

console.log(solve(['3', '4', '2', '3', '4', '2', '1', '12', '2', '3', '4']));