In this task, you will be presented with a question in Dutch language, and you have to write the person names from the question if present. B denotes the first item of a phrase and an I any non-initial word. Phrase used for the person name - PER. There can be instances with no person name entity, then return 'None'.

Example Input: Joker :
Example Output: None

Example Input: Cijfers in de VS vielen wat tegen
Example Output: None

Example Input: Tegelijk zal een accijns van 2,15 frank per liter LPG worden ingevoerd .
Example Output:
None