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// dictionary has to be a ciSet static Chain constructWordFromCISet(S word, Set dictionary) { if (contains(dictionary, word)) ret Chain<>(word); for (int i = 1; i < l(word); i++) if (contains(dictionary, takeFirst(i, word))) { Chain chain = constructWordFromCISet(substring(word, i), dictionary); if (chain != null) ret Chain(word, chain); } null; }