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:

What is this Miramar?

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Miramar",
        "Start": 13,
        "End": 20
    }
]

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

What is the best pos system I can buy in philadelphia pa?


"Results": [
    {
        "TypeName": "LOC",
        "Text": "philadelphia pa",
        "Start": 41,
        "End": 56
    }
]