Filtering rows by different columns

Question

In the data frame

  x1 x2 x3 x4 x5
1  0  1  1  0  3
2  1  2  2  0  3
3  2  2  0  0  2
4  1  3  0  0  2
5  3  3  2  1  4
6  2  0  0  0  1

colu