Are the items of a vector in a given data frame? (Filtering basics)

[1] "item 21 on row 1 and column 1"
[1] "item 21 on row 2 and column 1"
[1] "item 6 on row 1 and column 2"
[1] "item 6 on row 2 and column 2"
[1] "item 6 on row 4 and column 2"
[1] "item 6 on row 6 and column 2"
[1] "item 6 on row 10 and column 2"
[1] "item 6 on row 11 and column 2"
[1] "item 6 on row 30 and column 2"
     v1 v2
1  21.0  6
2  21.0  6
3  22.8  4
4  21.4  6
5  18.7  8
6  18.1  6
7  14.3  8
8  24.4  4
9  22.8  4
10 19.2  6
11 17.8  6
12 16.4  8
13 17.3  8
14 15.2  8
15 10.4  8
16 10.4  8
17 14.7  8
18 32.4  4
19 30.4  4
20 33.9  4
21 21.5  4
22 15.5  8
23 15.2  8
24 13.3  8
25 19.2  8
26 27.3  4
27 26.0  4
28 30.4  4
29 15.8  8
30 19.7  6
31 15.0  8
32 21.4  4