\begin{Schunk}
\begin{Sinput}
 df1
\end{Sinput}
\begin{Soutput}
  id          x
1  1 -0.9806329
2  2  0.6873321
3  3 -0.5050435
4  4  2.1577198
5  5 -0.5997976
6  6 -0.6945467
7  7  0.2239254
\end{Soutput}
\begin{Sinput}
 df2
\end{Sinput}
\begin{Soutput}
  id          x
1  2 -1.1562233
2  3  0.4224185
3  4 -1.3247553
4  5  0.1410843
5  6 -0.5360480
6  9 -0.3116061
7 10  1.5561096
\end{Soutput}
\end{Schunk}
