{
  "name": "Functions",
  "order": 12,
  "challenges": [
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      "title": "Functions",
      "description": [
        ""
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      "challengeSeed": [
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      "id": "59a5801209a6acac5983a940",
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        ""
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    {
      "id": "59a5801209a6acac5983a941",
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      "challengeSeed": [
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    {
      "id": "59a5801209a6acac5983a942",
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      "challengeSeed": [
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      "id": "59a5801209a6acac5983a943",
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      "challengeSeed": [
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    {
      "id": "59a5801209a6acac5983a944",
      "title": "Image and preimage",
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      "challengeSeed": [
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      "tests": [
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}