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    {
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      "title": "Return the head (top) of an rstack",
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    },
    {
      "page": "insert_back",
      "title": "Insert an element into the back of an rdeque or rpqueue",
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      ]
    },
    {
      "page": "insert_front",
      "title": "Insert an element into the front of an rdeque",
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    },
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      "title": "Insert an element onto the top of an rstack",
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    },
    {
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      "title": "Return the number of elements in an rdeque",
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    },
    {
      "page": "length.rstack",
      "title": "Return the number of elements in an rstack",
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      ]
    },
    {
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      "title": "Return the data element at the back of an rdeque",
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    },
    {
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    },
    {
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