Radio Astronomy Systems Research Group

You have 8 cards: two Aces, two Kings, two Queens, and two Jacks. You need to place then on a table in the following arrangement:

     X
 X X X
   X X X
     X

In addition, you need to follow these five rules:
1: Each Ace must be adjacent to a King
2: Each King must be adjacent to a Queen
3: Each Queen must be adjacent to a Jack
4: Queens cannot be adjacent to an Ace
5: Two of the same card cannot be adjacent to each other

For this problem, adjacent means horizontally or vertically next to each other. ¹⁾

answer