~~NOTOC~~
<=[[4rpl:start| Index]]

====== dup2 ======
dup2

===== Description =====
Duplicates the top two items currently on the stack without removing the original pair.

===== Examples =====
<code 4rpl>
trace4(42 1 dup2) #prints '42 1 42 1'
</code>
<=[[4rpl:start| Index]]