diff --git a/1ano/2semestre/poo/src/aula11/ex1/WordPairCounter.java b/1ano/2semestre/poo/src/aula11/ex1/WordPairCounter.java
new file mode 100644
index 0000000..66241ad
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula11/ex1/WordPairCounter.java
@@ -0,0 +1,66 @@
+package aula11.ex1;
+
+import java.io.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.*;
+
+public class WordPairCounter {
+    public static void main(String[] args) {
+        TreeMap<String, HashMap<String, Integer>> wordPairs = new TreeMap<>() {
+            @Override
+            public String toString() {
+                StringBuilder sb = new StringBuilder();
+                for (String word1 : this.keySet()) {
+                    sb.append(word1).append("={");
+                    for (String word2 : this.get(word1).keySet()) {
+                        sb.append(word2).append("=").append(this.get(word1).get(word2)).append(", ");
+                    }
+                    sb.delete(sb.length()-2, sb.length()).append("}\n");
+                }
+                return sb.toString();
+            }
+        };
+
+        String text = "";
+        Path path = Paths.get((new Scanner(System.in)).nextLine());
+        try {
+			text = Files.readString(path);
+		} catch (IOException e) {
+			System.out.printf("Certifique-se que o ficheiro \"%s\" está na raiz da pasta do projeto", path);
+            System.exit(1);
+		}
+        String[] words = text.split("[\\s.,:'‘’;?!\\-*{}=+&/()\\[\\]”“\"]+");
+
+        for (int i = 0; i < words.length; i++) {
+            String word1 = words[i];
+            if (word1.length() < 3) continue;
+            word1 = word1.toLowerCase();
+
+            String word2 = null;
+            for (int j = i+1; j < words.length; j++)
+                if (words[j].length() > 2) {
+                    word2 = words[j];
+                    break;
+                }
+            if (word2 == null) break;
+            word2 = word2.toLowerCase();
+
+            HashMap<String, Integer> word1Pair;
+            if (wordPairs.containsKey(word1))
+                word1Pair = wordPairs.get(word1);
+            else {
+                word1Pair = new HashMap<>();
+                wordPairs.put(word1, word1Pair);
+            }
+
+            if (word1Pair.containsKey(word2))
+                word1Pair.put(word2, word1Pair.get(word2) + 1);
+            else
+                word1Pair.put(word2, 1);
+        }
+
+        System.out.println(wordPairs);
+    }
+}