WHat is an example of a countable subset of $[0,1]$ whose Jordan content is 1 and Lebesgue measure is 0?

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E.Stein Real analysis p.41

Exhibit a countable subset $E\subset [0,1]$ such that $J(E)=1$ while $m*(E)=0$.

Here, $m*$ denotes the outer Lebesgue measure and $J$ denotes the Jordan content.

What would be this set?