The function counts the occurrences of the characters 'a', 'i', 'o', 'y', and 'u' in the input string and returns the count in the form of spelled out numbers. If none of these characters are present in the input, the function returns "none."

[CODE]:
```python
def f(x):
    count = 0
    for char in ['a', 'i', 'o', 'y', 'u']:
        count += x.lower().count(char)
    
    number_words = {0: "zero", 1: "one", 2: "two", 3: "three", 4: "four", 5: "five", 6: "six", 7: "seven", 8: "eight", 9: "nine", 10: "ten"}

    if count in number_words:
        return number_words[count]
    else:
        return "none"
```
Please note that this approximation may not be a perfect match for the original function, but it should capture its general behavior.