April 2006: Queen domination

A chessboard is dominated if every square either has a piece on it or is attacked by a piece. An 8x8 board can be dominated with 12 Knights as shown below.

Can you dominate a 5x12 board with 4 Queens?

Your final solution should be the chessboard with 4 Queens drawn in. Or, submit the positions of the 4 Queens based on the labeling of the board above.

You can download a printable version here: (pdf)

[If you solve this one, try dominating the 5x12 board with 10 Knights; a much harder problem.]