How many different kinds of NSString can we generate with the same code?

manystrings.swift

import Foundation

func examine(_ str: String) {
    print("\"\(str)\"")
    print("bridges as: \(type(of: str as NSString))")
    str.withCString {
        print("inits an NSString as: \(type(of: NSString(cString: $0, encoding: String.Encoding.ascii.rawValue)!))")
    }
    print("\n")
}

examine("hellohello")
examine("hellohellQ")
examine("hQllo")
examine("hëllo")
examine("hellohellohellohello")