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: Deze kinderen lagen minstens 10 procent van de nacht wakker in bed .
Example Output: None

Example Input: Nederland wereldkampioen . "
Example Output: None

Example Input: Europa verbiedt zijn lidstaten de grenzen te sluiten voor goederen uit andere landen .
Example Output:
None