Place letters in the empty hexagonal cells, such that the six hexagonal cells around each grey cell must contain letters from one of the words from the given list. The letters can be in any order. All the hexagonal cells must be used.
(Rules and example from WPC 2017 IB)
History of the puzzle
Unknown. The earliest instance so far is from WPC 2016/Round 12. However, this is likely not the first one, because it appeared in the "assorted" round with mostly common types. Author of that puzzle was Matúš Demiger (Slovakia).