added sequences with same endpoints

src/diagram.typ

@@ -7,7 +7,8 @@
   comment: none,
   dashed: false,
   tip: "default",
-  color: black
+  color: black,
+  flip: false
 ) = {
   return ((
     type: "seq",
@@ -17,6 +18,7 @@
     dashed: dashed,
     tip: tip,
     color: color,
+    flip: flip
   ),)
 }