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They didn't teach sign language, but that didn't prevent the kids from communicating. Spending time together. The other students spontaneously invented a fully graph, automatically a grammatical sign language, which is still used in the corrugula, and it's according to the language acquisition and development research laboratory. So it shows how fast that, if you look at that data, if you want to go and do a Google search online, look that up and find a very interesting how fast, particularly a language, although it's sign language, how fast that's developed.