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empty(x)
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empty(0) empty(1:10) empty(matrix(1:4, 2, 2)) empty(array(1:24, dim = c(2, 3, 4))) empty(list(a = 1, b = 2)) empty(data.frame(a = 1:2, b = 3:4)) empty(ts(1:10, frequency = 5))
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