1-1-3-3M
Rotate the lower left cell of the tile 180 degrees; mirror, then rotate the lower right cell of the tile 180 degrees.
-
-
1-1M-3M-3
Mirror alternate columns, then rotate alternate rows 180 degrees. You should note there are two sets of small squares: one with a border and one surrounded by the small arrows. Likewise, the border can also be viewed as a large square.
