diff --git a/.gitignore b/.gitignore
index 524f096..2740089 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+.idea/
+*.iml
+
 # Compiled class file
 *.class
 
diff --git a/java26/LazyConstants_1.snippet b/java27/LazyConstants_1.snippet
similarity index 100%
rename from java26/LazyConstants_1.snippet
rename to java27/LazyConstants_1.snippet
diff --git a/java26/LazyConstants_2.snippet b/java27/LazyConstants_2.snippet
similarity index 100%
rename from java26/LazyConstants_2.snippet
rename to java27/LazyConstants_2.snippet
diff --git a/java26/LazyConstants_3.snippet b/java27/LazyConstants_3.snippet
similarity index 100%
rename from java26/LazyConstants_3.snippet
rename to java27/LazyConstants_3.snippet
diff --git a/java26/LazyConstants_4.snippet b/java27/LazyConstants_4.snippet
similarity index 100%
rename from java26/LazyConstants_4.snippet
rename to java27/LazyConstants_4.snippet
diff --git a/java27/LazyConstants_5.snippet b/java27/LazyConstants_5.snippet
new file mode 100644
index 0000000..acde7e5
--- /dev/null
+++ b/java27/LazyConstants_5.snippet
@@ -0,0 +1,24 @@
+// Lazy Constants as Sets
+enum Days {
+    MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY
+}
+
+String validDays = "MONDAY THURSDAY SUNDAY";
+
+class Wrapper {
+    static final Set<Days> VALID_DAY =
+          Set.ofLazy(
+                EnumSet.allOf(Days.class),
+                day -> {
+                    IO.println("Checking day: " + day);
+                    return validDays.contains(day.name());
+                });
+}
+
+IO.println("Valid days are " + validDays);
+var isMondayValid = Wrapper.VALID_DAY.contains(Days.MONDAY);
+IO.println("Contains Monday: " + isMondayValid);
+IO.println("Contains Monday (no more check): " + isMondayValid);
+validDays = "TUESDAY THURSDAY SATURDAY";
+IO.println("Updating valid days to " + validDays);
+IO.println("Contains Monday (no more check): " + isMondayValid);
diff --git a/java26/LazyConstants_5.snippet b/java27/LazyConstants_6.snippet
similarity index 100%
rename from java26/LazyConstants_5.snippet
rename to java27/LazyConstants_6.snippet
diff --git a/java26/PrimitiveTypePatterns_1.snippet b/java27/PrimitiveTypePatterns_1.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_1.snippet
rename to java27/PrimitiveTypePatterns_1.snippet
diff --git a/java26/PrimitiveTypePatterns_10.snippet b/java27/PrimitiveTypePatterns_10.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_10.snippet
rename to java27/PrimitiveTypePatterns_10.snippet
diff --git a/java26/PrimitiveTypePatterns_2.snippet b/java27/PrimitiveTypePatterns_2.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_2.snippet
rename to java27/PrimitiveTypePatterns_2.snippet
diff --git a/java26/PrimitiveTypePatterns_3.snippet b/java27/PrimitiveTypePatterns_3.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_3.snippet
rename to java27/PrimitiveTypePatterns_3.snippet
diff --git a/java26/PrimitiveTypePatterns_4.snippet b/java27/PrimitiveTypePatterns_4.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_4.snippet
rename to java27/PrimitiveTypePatterns_4.snippet
diff --git a/java26/PrimitiveTypePatterns_5.snippet b/java27/PrimitiveTypePatterns_5.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_5.snippet
rename to java27/PrimitiveTypePatterns_5.snippet
diff --git a/java26/PrimitiveTypePatterns_6.snippet b/java27/PrimitiveTypePatterns_6.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_6.snippet
rename to java27/PrimitiveTypePatterns_6.snippet
diff --git a/java26/PrimitiveTypePatterns_7.snippet b/java27/PrimitiveTypePatterns_7.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_7.snippet
rename to java27/PrimitiveTypePatterns_7.snippet
diff --git a/java26/PrimitiveTypePatterns_8.snippet b/java27/PrimitiveTypePatterns_8.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_8.snippet
rename to java27/PrimitiveTypePatterns_8.snippet
diff --git a/java26/PrimitiveTypePatterns_9.snippet b/java27/PrimitiveTypePatterns_9.snippet
similarity index 100%
rename from java26/PrimitiveTypePatterns_9.snippet
rename to java27/PrimitiveTypePatterns_9.snippet
diff --git a/pg26menu.json b/pg27menu.json
similarity index 86%
rename from pg26menu.json
rename to pg27menu.json
index e371553..3bcbb82 100644
--- a/pg26menu.json
+++ b/pg27menu.json
@@ -152,78 +152,82 @@
     {
       "category": "Primitive Type Pattern",
       "badge": {
-        "text": "Java 26",
+        "text": "Java 27",
         "type": "java-version"
       },
       "subcategories": [
         {
           "category": "… for instanceOf",
-          "source_uri": "java26/PrimitiveTypePatterns_1"
+          "source_uri": "java27/PrimitiveTypePatterns_1"
         },
         {
           "category": "… for switch",
-          "source_uri": "java26/PrimitiveTypePatterns_2"
+          "source_uri": "java27/PrimitiveTypePatterns_2"
         },
         {
           "category": "Narrowing Integer Number Primitive Pattern",
-          "source_uri": "java26/PrimitiveTypePatterns_3"
+          "source_uri": "java27/PrimitiveTypePatterns_3"
         },
         {
           "category": "Narrowing Floating Point Number Primitive Pattern",
-          "source_uri": "java26/PrimitiveTypePatterns_4"
+          "source_uri": "java27/PrimitiveTypePatterns_4"
         },
         {
           "category": "Integer Number to Floating Point Number Primitive Pattern",
-          "source_uri": "java26/PrimitiveTypePatterns_5"
+          "source_uri": "java27/PrimitiveTypePatterns_5"
         },
         {
           "category": "Floating Point Number to Integer Number Primitive Pattern",
-          "source_uri": "java26/PrimitiveTypePatterns_6"
+          "source_uri": "java27/PrimitiveTypePatterns_6"
         },
         {
           "category": "Double Number to Integer Number Primitive Pattern",
-          "source_uri": "java26/PrimitiveTypePatterns_7"
+          "source_uri": "java27/PrimitiveTypePatterns_7"
         },
         {
           "category": "Boolean Primitive Pattern",
-          "source_uri": "java26/PrimitiveTypePatterns_8"
+          "source_uri": "java27/PrimitiveTypePatterns_8"
         },
         {
           "category": "Double Primitive Pattern",
-          "source_uri": "java26/PrimitiveTypePatterns_9"
+          "source_uri": "java27/PrimitiveTypePatterns_9"
         },
         {
           "category": "JSON Analysis",
-          "source_uri": "java26/PrimitiveTypePatterns_10"
+          "source_uri": "java27/PrimitiveTypePatterns_10"
         }
       ]
     },
     {
       "category": "Lazy Constant",
       "badge": {
-        "text": "Java 26",
+        "text": "Java 27",
         "type": "java-version"
       },
       "subcategories": [
         {
           "category": "Static Initializers",
-          "source_uri": "java26/LazyConstants_1"
+          "source_uri": "java27/LazyConstants_1"
         },
         {
           "category": "Enum Initializers",
-          "source_uri": "java26/LazyConstants_2"
+          "source_uri": "java27/LazyConstants_2"
         },
         {
           "category": "… with Suppliers",
-          "source_uri": "java26/LazyConstants_3"
+          "source_uri": "java27/LazyConstants_3"
         },
         {
           "category": "… as Lists",
-          "source_uri": "java26/LazyConstants_4"
+          "source_uri": "java27/LazyConstants_4"
+        },
+        {
+          "category": "… as Sets",
+          "source_uri": "java27/LazyConstants_5"
         },
         {
           "category": "… as Maps",
-          "source_uri": "java26/LazyConstants_5"
+          "source_uri": "java27/LazyConstants_6"
         }
       ]
     },