How to skip top header and bottom header with Tidyverse tools such as dplyr?

I want to learn skipping the top header and the bottom header in tidyverse tools.

aaaaaaaaaaaaaaaaaaa aaaaaaaaaa aaaaaaa aaaaaaaaaaaa aaaaa aaaaaaaaaaaaaaaaa;;;
aaaaaaaaaaaaaaa;;;
;aaaaa(%);;
;aaaaaaaaaa;aaaaaaaaaaaaa;

 aa/33;3.3;3.3;
 a/33;3.3;3.3;
aa/33;3.3;33.3;
 a/33;3.3;33.3;
 aa/33;3.3;33.3;
 a/33;3.3;33.3;
aaaaaaa aaaaaaaa aa
aaaaaaa: %
aaaaa: aaaaaaaaa aaaaaa aaaaaaa / aaaaaaa aaaaaaaa aa;;;

There are 5 rows long top header at the start while the end has 3 rows long bottom header.

How can I skip them with Tidyverse tools in R?