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: Cornet d'Elzius is op dit ogenblik kabinetsadviseur van staatssecretaris voor Buitenlandse Handel Pierre Chevalier ( VLD ) .
Example Output: Cornet: B-PER, d'Elzius: I-PER, Pierre: B-PER, Chevalier: I-PER

Example Input: De terugkeer van de gekwetste Patrick Ewing vond Van Gundy waardevol .
Example Output: Patrick: B-PER, Ewing: I-PER, Van: B-PER, Gundy: I-PER

Example Input: Gehoopt wordt dat volgend jaar de verliezen tot het verleden behoren .
Example Output:
None