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barter▼(exchange of goods or services)noun[UK: ˈbɑː.tə(r)] [US: ˈbɑːr.tər]
permutation [permutations]▼(one-to-one mapping)noun[UK: ˌpɜː.mjuː.ˈteɪʃ.n̩] [US: ˌpər.mjuː.ˈteɪʃ.n̩]
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