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'.

Ex Input:
DE FLAT

Ex Output:
None


Ex Input:
Hij volgt in die functie baron Willem van de Voorde op .

Ex Output:
Willem: B-PER, van: I-PER, de: I-PER, Voorde: I-PER


Ex Input:
Hij vreesde dat ik er te sterk bij betrokken zou raken .

Ex Output:

None