diff --git a/.gitignore b/.gitignore
index fd09e73..4d117a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .dub/
 bin/
 .vscode/
+autocreation-dub.sh
diff --git a/src/example_4/.gitignore b/src/example_4/.gitignore
new file mode 100644
index 0000000..8c746a9
--- /dev/null
+++ b/src/example_4/.gitignore
@@ -0,0 +1,15 @@
+.dub
+docs.json
+__dummy.html
+docs/
+/example_4
+example_4.so
+example_4.dylib
+example_4.dll
+example_4.a
+example_4.lib
+example_4-test-*
+*.exe
+*.o
+*.obj
+*.lst
diff --git a/src/example_4/dub.json b/src/example_4/dub.json
new file mode 100644
index 0000000..4d80df5
--- /dev/null
+++ b/src/example_4/dub.json
@@ -0,0 +1,9 @@
+{
+  "authors": [
+    "alexander"
+  ],
+  "description": "Массивы и ассоциативные массивы. Работа со словарем.",
+  "license": "proprietary",
+  "name": "example_4",
+  "targetPath": "bin"
+}
diff --git a/src/example_4/source/app.d b/src/example_4/source/app.d
new file mode 100644
index 0000000..9f8e426
--- /dev/null
+++ b/src/example_4/source/app.d
@@ -0,0 +1,16 @@
+import std.stdio, std.string;
+
+void main()
+{
+	size_t [string] dictionary;
+    foreach (line; stdin.byLine)
+    {
+        foreach (word; strip(line).split)
+        {
+            if (word in dictionary) continue;
+            auto newID = dictionary.length;
+            dictionary[word.idup] = newID;
+            writeln(newID, '\t', word);
+        }
+    }
+}