diff --git a/README.md b/README.md
index fbcd133..1015a55 100644
--- a/README.md
+++ b/README.md
@@ -32,3 +32,4 @@
 - https://tinchicus.com/2022/07/18/rust-enum/ (enums)
 - https://tinchicus.com/2022/07/19/rust-patrones-y-coincidencias/ (iflet)
 - https://tinchicus.com/2022/07/20/rust-ownership/ (prop)
+- https://tinchicus.com/2022/07/21/rust-copy-trait/ (copiari32, copiar)
diff --git a/copiar/Cargo.toml b/copiar/Cargo.toml
new file mode 100644
index 0000000..804619b
--- /dev/null
+++ b/copiar/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "copiar"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/copiar/src/main.rs b/copiar/src/main.rs
new file mode 100644
index 0000000..ea171d5
--- /dev/null
+++ b/copiar/src/main.rs
@@ -0,0 +1,12 @@
+fn sumar(v1: Vec<i32>, v2: Vec<i32>) -> (Vec<i32>, Vec<i32>, i32) {
+    let sum = v1.iter().fold(0i32, |a, &b| a + b);
+    let prod = v2.iter().fold(1i32, |a, &b| a * b);
+    return (v1, v2, sum + prod);
+}
+
+fn main() {
+    let vecuno = vec![2, 3, 5];
+    let vecdos = vec![3, 5];
+    let (vecuno, vecdos, rta) = sumar(vecuno, vecdos);
+    println!("{} + {} = {}", vecuno[0], vecdos[0], rta);
+}
diff --git a/copiari32/Cargo.toml b/copiari32/Cargo.toml
new file mode 100644
index 0000000..7335343
--- /dev/null
+++ b/copiari32/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "copiari32"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/copiari32/src/main.rs b/copiari32/src/main.rs
new file mode 100644
index 0000000..635fa28
--- /dev/null
+++ b/copiari32/src/main.rs
@@ -0,0 +1,9 @@
+fn incrementar(n: i32) -> i32 {
+    n + 32
+}
+
+fn main() {
+    let num = 10i32;
+    let num2 = incrementar(num);
+    println!("num: {}, num2: {}", num, num2);
+}