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?

As these guidelines need to be approved by Houston, I am copying this to Mark, Alan and Jeff.


"Results": [
    {
        "TypeName": "LOC",
        "Text": "Houston",
        "Start": 43,
        "End": 50
    },
    {
        "TypeName": "PER",
        "Text": "Mark",
        "Start": 73,
        "End": 77
    },
    {
        "TypeName": "PER",
        "Text": "Alan",
        "Start": 79,
        "End": 83
    },
    {
        "TypeName": "PER",
        "Text": "Jeff",
        "Start": 88,
        "End": 92
    }
]