vim paste multilines before multilines, no Blank - vim

Question

Let's say I have these two blocks:
1
23
456
hello..
world world
codecode
And then I need this block (between 1 and hello.., without any spaces between):
1hello..
23world world
456codecode
What is the best fast way?
I used gvim7.3.46 on windows xp and windows 7
this is my _vimrc
set nocompatible
source $VIMRUNTIME/vimrc_example.vim
source $VIMRUNTIME/mswin.vim
behave mswin
set diffexpr=MyDiff()
function MyDiff()
let opt = '-a --binary '
if &diffopt =~ 'icase' | let opt = opt . '-i ' | endif
if &diffopt =~ 'iwhite' | let opt = opt . '-b ' | endif
let arg1 = v:fname_in
if arg1 =~ ' ' | let arg1 = '"' . arg1 . '"' | endif
let arg2 = v:fname_new
if arg2 =~ ' ' | let arg2 = '"' . arg2 . '"' | endif
let arg3 = v:fname_out
if arg3 =~ ' ' | let arg3 = '"' . arg3 . '"' | endif
let eq = ''
if $VIMRUNTIME =~ ' '
if &sh =~ '\<cmd'
let cmd = '""' . $VIMRUNTIME . '\diff"'
let eq = '"'
else
let cmd = substitute($VIMRUNTIME, ' ', '" ', '') . '\diff"'
endif
else
let cmd = $VIMRUNTIME . '\diff'
endif
silent execute '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' . arg3 . eq
endfunction
I used C-r", but that did not work.
1
23
456
hello..
world world
codecode
I used C-q, y, C-p, the result is:
1
23
456
1 hello..
23 world world
456codecode

Answer 1

Place the cursor on 1.
Hit <C-v> to enter visual-block mode.
Move the cursor down to 456 and hit $ to select the whole block.
Hit y to yank that block.
Place the cursor on the h in hello.
Hit P.

Answer 2

I would use visual block mode. Do like this:
At the start of the first block, press <C-v> to enter visual block mode.
Select the relevant lines, and press $ to extend the selection to the end of the line.
Press d to delete the first block. This will also copy it.
Then press P at the beginning of the second block to paste the first block before the second block with no spaces in between.
The first line range will then be empty, so you will have to delete those lines if you don't want them.

Answer 3

Using a recursive macro to jump back and forth between to two blocks, deleting and joining lines:
qq}jdd''pkgJj#qq
Notable keystrokes:
'' jumps back to the line where you jumped from the most recently
#q calls the macro q from inside the definition of q
gJ joins two lines without a space between them