//over diagonally

                    if (col != 0) {

                        int up = col-1;

                        for (up = col-1; up >= 0; up--) {

                            // back
                            if (row != 0) {

                                for (int back = col - 1; back >= 0; back--) {

                                    if (lines.get(up).charAt(back) == '#') {

                                        int offsetX = col - back;
                                        int offsetY = row - up;

                                        int x = back - offsetX;
                                        int y = up - offsetY;

                                        while (x >= 0 && y >= 0)
                                        {
                                            temp[y][x] = '.';
                                            x -= offsetX;
                                            y -= offsetY;

                                        }
                                    }
                                }
                            }
                        }
                    }