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a! b! a.unwrap() raise A; A?; [ 1, 2, 3\ 4, 5, 6 ] @matrix(3, 4) [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, ] @matrix(3, 4) [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, ]