{
    "hints":  [
                  {
                      "text":  "Fold the figure along Line AB in your mind.",
                      "level":  1
                  },
                  {
                      "text":  "Do the two halves match exactly on both sides of Line AB?",
                      "level":  2
                  },
                  {
                      "text":  "Line AB splits the figure into two identical halves, so it is a line of symmetry.",
                      "level":  3
                  }
              ]
}