I have a data frame, for exampe

> dat <- data.frame(a=rnorm(5),b=rnorm(5),c=rnorm(5))
           a            b          c
1 -0.1731141  0.002453991  0.1180976
2  1.2142024 -0.413897606  0.7617472
3 -0.9428484 -0.609312786  0.5132441
4  0.1343336  0.178208961  0.7509650
5 -0.1402286 -0.333476839 -0.4959459

How to make dat2 from dat, where source data frame be ordered by any column?

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