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+# Variables can be declared using the `let` keyword, however they will be deeply
+# immutable. If you would like to make the variable mutable you can use `let mut`
+#
+# Variables can not be exported and can not be referrenced accross modules.
+let x = 0;
+let mut y = 0;
+
+x = 5; # Invalid
+y = 5; # Valid
+
+# Constants can be declared using the `const` keyword, unlike variables they can
+# be exported and accessed across modules.
+const FPS = 60;
+
+pub const WIDTH = 5;
+pub const HEIGHT = 17;