diff --git a/AlgebraicDataflowArchitectureModel/models/BagTest.model b/AlgebraicDataflowArchitectureModel/models/BagTest.model
new file mode 100644
index 0000000..3a27bfa
--- /dev/null
+++ b/AlgebraicDataflowArchitectureModel/models/BagTest.model
@@ -0,0 +1,8 @@
+channel signUp {
+	out accounts(acs: Map, signUp(id, name)) = insert(acs, id, {"name": name, "friends": nil})
+}
+
+channel makeFriend(aid) {
+	out accounts.{aid}.friends(friends: List, addFreinds(fid)) = append(friends, fid)
+	out accounts.{fid}.friends(friends: List, addFreinds(fid)) = append(friends, aid)
+}
\ No newline at end of file