function filter(input) {
    let n = Number(input.pop());
    let matrix = input
        .map(x => Array.from(x))
        .map(x => x.filter(x => x != ' '))
        .map(x => x.map(Number));

    for (let row = 0; row < matrix.length; row++) {
        for (let col = 0; col < matrix[row].length; col++) {
            let a = matrix[row][col];
            for (let i = 1; i < n; i++) {
                let b = matrix[row][i + col];
                if (a == b) {
                    matrix[row][i + col] = ' ';
                    if (n - i == 1) {
                        matrix[row][col] = ' ';
                    }
                }
            }
        }
    }



    //console.log([...matrix].join('\n'));
}
filter([
    '3 3 3 2 5 9 9 9 9 1 2',
    '1 1 1 1 1 2 5 8 1 1 7',
    '7 7 1 2 3 5 7 4 4 1 2',
    '2'
]);