diff --git a/duplicates/Cargo.toml b/duplicates/Cargo.toml
new file mode 100644
index 0000000..40f182e
--- /dev/null
+++ b/duplicates/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "duplicates"
+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/duplicates/src/main.rs b/duplicates/src/main.rs
new file mode 100644
index 0000000..355e4cd
--- /dev/null
+++ b/duplicates/src/main.rs
@@ -0,0 +1,19 @@
+
+fn duplicates<T>(arr: &[T]) -> usize where T: PartialEq {
+    let mut dups = 0;
+    for x in 0..arr.len() {
+        let to_cmp = &arr[x];
+        for y in (x+1)..arr.len() {
+            if &arr[y] == to_cmp {
+                dups += 1;
+            }
+        }
+    }
+    dups * 2
+}
+
+fn main() {
+    let arr = ['😇', '🙈', '💀', '💦', '💣', '💀'];
+
+    println!("Duplicates: {}", duplicates(&arr));
+}
diff --git a/fibonacci/Cargo.toml b/fibonacci/Cargo.toml
new file mode 100644
index 0000000..9cd048e
--- /dev/null
+++ b/fibonacci/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "fibonacci"
+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/fibonacci/src/main.rs b/fibonacci/src/main.rs
new file mode 100644
index 0000000..3737ddb
--- /dev/null
+++ b/fibonacci/src/main.rs
@@ -0,0 +1,25 @@
+
+fn fib_rec(x: u128) -> u128 {
+    if x < 2 {
+        return x;
+    }
+
+    return fib_rec(x - 1) + fib_rec(x - 2);
+}
+
+fn fib_loop(x: u128) -> u128 {
+    let mut sum = 0;
+    let mut sum2 = 1;
+
+    for x in 0..(x-1) {
+        let t = sum;
+        sum = sum2;
+        sum2 = t + sum;
+    }
+    sum2
+}
+
+fn main() {
+
+    println!("{}", fib_loop(5));
+}
diff --git a/tuple_arithmetic/Cargo.toml b/tuple_arithmetic/Cargo.toml
new file mode 100644
index 0000000..df179e8
--- /dev/null
+++ b/tuple_arithmetic/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "rust_playground"
+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/tuple_arithmetic/src/main.rs b/tuple_arithmetic/src/main.rs
new file mode 100644
index 0000000..6e42e8d
--- /dev/null
+++ b/tuple_arithmetic/src/main.rs
@@ -0,0 +1,38 @@
+/* Compressed version:
+ *
+ *  type V=(f64,f64);fn t(a:V,b:V,f:fn(
+ *  a:f64,b:f64)->f64)->V{(f(a.0,b.0),f
+ *  (a.1,b.1))}fn main(){print!("{:?}",
+ *  t(t((2.42,2.07),(0.3,3.2),|a,b|{a/b
+ *  }),t((1.7,2.3),(0.73,0.42),|a,b|{a*
+ *  b}),|a,b|{a-b}))}
+ *
+ */
+
+
+fn merge_tuple(a: (f64, f64), b: (f64, f64), f: fn (a: f64, b: f64) -> f64) -> (f64, f64) {
+    (
+        f(a.0, b.0),
+        f(a.1, b.1),
+    )
+}
+
+fn add_tuple(a: (f64, f64), b: (f64, f64)) -> (f64, f64) {
+    merge_tuple(a, b, |a, b| a + b)
+}
+
+fn sub_tuple(a: (f64, f64), b: (f64, f64)) -> (f64, f64) {
+    merge_tuple(a, b, |a, b| a - b)
+}
+
+fn mul_tuple(a: (f64, f64), b: (f64, f64)) -> (f64, f64) {
+    merge_tuple(a, b, |a, b| a * b)
+}
+
+fn div_tuple(a: (f64, f64), b: (f64, f64)) -> (f64, f64) {
+    merge_tuple(a, b, |a, b| a / b)
+}
+
+fn main() {
+    println!("{:#?}", sub_tuple(div_tuple((2.42, 2.07), (0.3, 3.2)), mul_tuple((1.7, 2.3), (0.73, 0.42))));
+}