13. (15 points) The figure on the right is a $2 \times 1$ rectangular grid, consisting of two identical small squares. Using 8 of these rectangles, a $4 \times 4$ square can be formed. If one formed square can be rotated to match another formed square, they are considered the same. How many different squares, with at least 2 axes of symmetry, can be formed from all possible arrangements?
【Analysis】According to the definition of an axisymmetric figure and the method of determining the axis of symmetry of an axisymmetric figure, the problem can be solved by drawing a diagram for analysis.
【Solution】Solution: When the axes of symmetry are the medians and the medians, the figures obtained are:
When the axes of symmetry are the medians and the diagonals or the diagonals and the diagonals, the figures obtained are:
Therefore, there are a total of: $4+2=6$ types.
Answer: There are 6 types of figures with at least 2 axes of symmetry.