[Tex/LaTex] How to print a book (A6 size), 4 times into an A4 size paper

Question

I have a latex prepared doublesided pdf, it has 130 pages.
I just want a result where I can cut the A4 paper into 4 parts and get 4 separate a6 books. No need to set frames, just cut the paper in each half.

I now there are many instructions on how to insert certain size page into a pdf of other size, but none gives instructions on how to place the same document multiplied by four and with this x4 page order on each page.

So, the first A4 page should be seen with 4 times the first a6 page, and the second page the same, and so on.

1st page (with 4 a6 sized print)

• [1][1]
• [1][1]

2nd page (with 4 a6 sized print)

• [2][2]
• [2][2]

etc.

Answer 1

\documentclass{article}
\usepackage[a4paper,margin=0pt,nofoot,nohead]{geometry}
\usepackage{graphicx}
\newcommand{\fourplay}[2]% #1 = page number (text), #2 = file name
{\pagebreak\includegraphics[page=#1]{#2}\includegraphics[page=#1]{#2}\par
\includegraphics[page=#1]{#2}\includegraphics[page=#1]{#2}\par}
\parindent=0pt
\parskip=0pt
\begin{document}
\loop\fourplay{\thepage}{test5.pdf}
\ifnum\value{page}<2\relax \repeat% 2=number of pages
\end{document}

where the file test5.pdf was created using

\documentclass{article}
\usepackage[a6paper]{geometry}
\usepackage{lipsum}
\begin{document}
\lipsum[1-10]
\end{document}