function complement(A, B)
{
    var M = A.length, N = B.length, c = 0, C = [];
    for (var i = 0; i < M; i++)
    {
        var j = 0, k = 0;
        while (B[j] !== A[ i ] && j < N) j++;
        while (C[k] !== A[ i ] && k < c) k++;
        if (j == N && k == c) C[c++] = A[ i ];
    }
    return C;
}