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You are on a trip to a tropical island. As you find out, the island is inhabited by three tribes. As it turns out, you arrive right when the chiefs of these tribes are all meeting. One chief is wearing a blue headress, one is wearing a green one, and the other is wearing white. One cheif always tells the truth, one always lies, and one can either tell the truth or lie, but you don't know which is which. The chiefs are very busy and only have time to answer one yes-or-no question each, and each question must be directed at one of the chiefs. The chiefs can understand English but they can't speak it, so they answer in their own language. You know that the words "da" and "ja" mean "yes" and "no", but you do not know which word means which. Taking that all into consideration, what questions will you ask to determine which chief is the truth-teller, which lies, and which can do both?