Not Alone 6x6 Puzzle 27
In each empty box put either A or Z in such a way that every row and every column should each have 3 A-s and 3 Z-s and there should never by a lonely A between 2 Z's and never a lonely Z between 2 A's. In other words neither AZA nor ZAZ should ever show up, be it in a row or a column.
