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: Ze kregen allemaal hun exemplaar .
Example Output: None

Example Input: Hij volgt in die functie baron Willem van de Voorde op .
Example Output: Willem: B-PER, van: I-PER, de: I-PER, Voorde: I-PER

Example Input: Binnen de VLD in Dendermonde heerst er grote verslagenheid .
Example Output:
None