diff --git a/SQ-2023-H6/answer.md b/SQ-2023-H6/answer.md
new file mode 100644
index 0000000..caf4dec
--- /dev/null
+++ b/SQ-2023-H6/answer.md
@@ -0,0 +1,28 @@
+---
+title: Software Quality & Testing -- Graded Assignment 6
+author: Claudio Maggioni
+geometry: margin=2.5cm,bottom=3cm
+---
+
+# Are there mutants that you cannot kill?
+
+Yes.
+
+# If yes, why and which are mutants that you cannot kill?
+
+The mutants I cannot kill are:
+
+```
+replaced boolean return with true for org/usi/sq/util/CircularFifoQueue::offer → SURVIVED
+```
+
+at line 135 (which is impossible to kill since the parent method always returns true, thus 
+the mutant is semantically equivalent to the implementation), and:
+
+```
+changed conditional boundary → SURVIVED
+changed conditional boundary → SURVIVED
+negated conditional → SURVIVED
+```
+
+for `if (start < lastReturnedIndex && pos < end)` at line 251.
\ No newline at end of file
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diff --git a/SQ-2023-H6/report.pdf b/SQ-2023-H6/report.pdf
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diff --git a/SQ-2023-H6/src/test/java/org/usi/sq/util/CircularFifoQueueTest.java b/SQ-2023-H6/src/test/java/org/usi/sq/util/CircularFifoQueueTest.java
index a779e38..10adafe 100644
--- a/SQ-2023-H6/src/test/java/org/usi/sq/util/CircularFifoQueueTest.java
+++ b/SQ-2023-H6/src/test/java/org/usi/sq/util/CircularFifoQueueTest.java
@@ -8,23 +8,23 @@ import static org.junit.jupiter.api.Assertions.*;
 
 class CircularFifoQueueTest {
 
-    private void testIteratorEmpty(Iterator<?> it) {
+    private void testIteratorEmpty(final Iterator<?> it) {
         assertFalse(it.hasNext());
         assertThrows(NoSuchElementException.class, it::next);
     }
 
-    private <T> void testIteratorNext(Iterator<T> it, T e) {
+    private <T> void testIteratorNext(final Iterator<T> it, final T e) {
         assertTrue(it.hasNext());
         assertEquals(e, it.next());
     }
 
-    private <T> void testQueue(int initQueueSize, List<T> values, long removeQueueCount, List<Integer> itrRemoveIndexes) {
+    private <T> void testQueue(final int initQueueSize, final List<T> values, final long removeQueueCount, final List<Integer> itrRemoveIndexes) {
         final Set<Integer> removeIndexesSet = new HashSet<>(itrRemoveIndexes);
 
         final CircularFifoQueue<T> queue = new CircularFifoQueue<>(initQueueSize);
         for (T e : values) assertTrue(queue.offer(e));
 
-        int queueSizeAfterOffers = Math.min(initQueueSize, values.size());
+        final int queueSizeAfterOffers = Math.min(initQueueSize, values.size());
         for (int i = 0; i < removeQueueCount; i++) {
             assertEquals(values.get(values.size() - queueSizeAfterOffers + i), queue.remove());
         }
@@ -39,7 +39,7 @@ class CircularFifoQueueTest {
 
         // Test Iteration
         for (int i = 0; i < expected.size(); i++) {
-            T e = expected.get(i);
+            final T e = expected.get(i);
             testIteratorNext(it, e);
 
             if (removeIndexesSet.contains(i)) {
@@ -59,11 +59,11 @@ class CircularFifoQueueTest {
     }
 
     @SafeVarargs
-    public final <T> List<T> list(T... es) {
+    public final <T> List<T> list(final T... es) {
         return Arrays.asList(es);
     }
 
-    public final List<Integer> range(int start, int end) {
+    public final List<Integer> range(final int start, final int end) {
         if (end < start) throw new IllegalArgumentException();
 
         final List<Integer> toReturn = new ArrayList<>(end - start);
@@ -71,7 +71,6 @@ class CircularFifoQueueTest {
         return toReturn;
     }
 
-
     @Test
     public void testIterator() {
         assertThrows(IllegalArgumentException.class, () -> new CircularFifoQueue<Void>(0));
@@ -87,6 +86,7 @@ class CircularFifoQueueTest {
         testQueue(4, range(0, 9), 0, list(1, 3));
         testQueue(7, range(0, 13), 4, list(1, 3));
         testQueue(7, range(0, 13), 2, list(0, 2, 4, 5, 6));
+        testQueue(5, range(0, 34), 2, list(0, 2, 4));
         testQueue(4, range(0, 5), 0, list(1, 3));
         testQueue(10, empty, 0, empty);
         testQueue(4, range(0, 5), 1, empty);