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?

Dari and I vented our aggravation by drafting the attached letter to Gibson and Kyle complaining of Sommer 's duplicity, but after tempers cooled, MKM and I decided not to send it to Stan or urge him to send a written response.


"Results": [
    {
        "TypeName": "PER",
        "Text": "Gibson",
        "Start": 69,
        "End": 75
    },
    {
        "TypeName": "PER",
        "Text": "Kyle",
        "Start": 80,
        "End": 84
    },
    {
        "TypeName": "PER",
        "Text": "Sommer",
        "Start": 100,
        "End": 106
    },
    {
        "TypeName": "PER",
        "Text": "MKM",
        "Start": 147,
        "End": 150
    },
    {
        "TypeName": "PER",
        "Text": "Stan",
        "Start": 183,
        "End": 187
    }
]