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    "# DATA Step Structure \n",
    "\n",
    "`DATA` steps are declared by the keyword `data` followed by an output dataset that SAS will write to. The output dataset may be a temporary file (no `libname`). In most applications, you will specify an input dataset using the `set` statement. This is the data SAS will read in, manipulate, and save to the output file. The `set` and `data` file can be the same file. You can also append multiple datasets together by listing multiple inputs to the `set` statement. To conclude the `data` step you use a `run` statement.\n",
    "\n",
    "```sas\n",
    "data library.out_filename;\n",
    "    set library.in_filename;\n",
    "        /* data step statements go here */\n",
    "run;\n",
    "```\n",
    "\n",
    "You can append `in_filename_1` and `in_filename_2` like so\n",
    "\n",
    "```sas\n",
    "data library.out_filename;\n",
    "    set library.in_filename_1 library.in_filename_2;\n",
    "    /* data step statements */\n",
    "run;\n",
    "```"
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