diff --git a/std/dup2.lb b/std/dup2.lb
new file mode 100644
index 0000000..ba91170
--- /dev/null
+++ b/std/dup2.lb
@@ -0,0 +1,6 @@
+@ 0
+ args 2
+ push 1
+ pick
+ push 1
+ pick
diff --git a/std/dup4.lb b/std/dup4.lb
new file mode 100644
index 0000000..4218f40
--- /dev/null
+++ b/std/dup4.lb
@@ -0,0 +1,10 @@
+@ 0
+ args 4
+ push 3
+ pick
+ push 3
+ pick
+ push 3
+ pick
+ push 3
+ pick