Given a list of distinct words, return every word that can be built by concatenating at least two other, shorter words from the same list — reusing a word as many times as needed, in any order. This is Word Break run once per word, with the rest of the same list playing the role of the dictionary — a word "counts" exactly when it's fully covered by pieces drawn from the shared trie. The only wrinkle: the word trivially "matches itself" as a single whole piece, and that doesn't count as a real concatenation, so that one specific match — the entire word, taken in one bite, starting from position zero — gets explicitly excluded. Everything else about the reachability walk is identical to Word Break.