diff --git a/sample.js b/sample.js
index 1075ac2..dee8ba7 100644
--- a/sample.js
+++ b/sample.js
@@ -1,21 +1,29 @@
-// this is a comment
 const func = (a, b, c, d, e, f, s, n) => {
-    if (a++ && b-- || c >= d || e <= f) {      
+// this is a comment
+    if (a++ && b-- || c >= d || e <= f) {
     }
     if (s === 'string' && n !== 999) {
     }
     if (a == b && c != d)
-    
+    a ?? b
     a <- b <-- c <== d
-
-    a <| b |> c -> d ==> e 
-    
-  }
-  <!-- test -->
+    a |> b
+    a <| b |> c -> d ==> e
 
   // italic ligatures
   // != == >= <= -> => ==>
   // === !== && || ++ --
   // a <- b <-- c <== d
-  // a <| b |> c -> d ==> e 
-  
\ No newline at end of file
+  // a <| b |> c -> d ==> e
+  // a ?? b
+  // >=>  <=<
+  // <=>
+  // >>=  =<<
+
+    a >=> b <=< b
+    a <=> b
+    a >>=  =<<
+
+  }
+
+  <!-- test -->