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    "# Chapter 7: Sequential Data (TL;DR)"
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    "**Sequences** are an *abstract* concept that summarizes *four* behaviors an object may or may not exhibit. Sequences are\n",
    "- **finite** and\n",
    "- **ordered**\n",
    "- **containers** that we may\n",
    "- **loop over**.\n",
    "\n",
    "Examples are the `list`, `tuple`, but also the `str` types.\n",
    "\n",
    "Objects that exhibit all behaviors *except* being ordered are referred to as **collections**.\n",
    "\n",
    "The objects inside a sequence are called its **elements** and may be labeled with a unique **index**, an `int` object in the range $0 \\leq \\text{index} < \\lvert \\text{sequence} \\rvert$.\n",
    "\n",
    "`list` objects are **mutable**. That means we can change the references to the other objects it contains, and, in particular, re-assign them.\n",
    "\n",
    "On the contrary, `tuple` objects are like **immutable** lists: We can use them in place of any `list` object as long as we do *not* need to mutate it. Often, `tuple` objects are also used to model **records** of related **fields**."
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