Please identify all the named entities mentioned in the input sentence provided below. Use only the categories: PER - person, ORG - organization, and LOC - location.
Remember, nationalities are neither locations nor organizations, and organizations can represent other groups of people.
Pay attention to the provided example. You should only output the results in JSON format, following a similar structure to the example result provided.

Example sentence and results:

Where in the world is Iguazu?

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Iguazu",
        "Start": 22,
        "End": 28
    }
]

Considering the input sentence below, what is the output result?

we have made a furnace as such, we took a clay flower pot with a hole in the bottom put a piece of steel pipe in the middle of it with a cap on the bottom, filled the pipe with brass scrap, surounded the pipe with charcoal lit it off and pumped air through the hole in the pot, everything got red hot but did not melt.


"Results": []