I am actually stuck level 10 at vim-adventures, but this question concerns vim in general.
I have a new file with this content:
99 bottles of beer
If I yank the line with "aY I get
99 bottles of beer<cr>, if I do "a0y$ I get
99 bottles of beer without the new line.
The question is how can I just append
<cr> that I yank from somewhere into my registers?