{
  "name": "Polya's Enumeration Formula",
  "order": 9,
  "challenges": [
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      "id": "59a5801209a6acac5983b619",
      "title": "Equivalence and symmetry groups",
      "description": [
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    {
      "id": "59a5801209a6acac5983a984",
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    {
      "id": "59a5801209a6acac5983a985",
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    {
      "id": "59a5801209a6acac5983a986",
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}