{
    "hints":  [
                  {
                      "text":  "Try colouring each pair of squares in your mind.",
                      "level":  1
                  },
                  {
                      "text":  "Check: do both sides of the figure look the same after colouring that pair?",
                      "level":  2
                  },
                  {
                      "text":  "B and D together balance both sides and make the figure symmetric.",
                      "level":  3
                  }
              ]
}