diff --git a/common/graph-nodes-1.svg b/common/graph-nodes-1.svg
new file mode 100644
index 0000000..fea70f3
--- /dev/null
+++ b/common/graph-nodes-1.svg
@@ -0,0 +1,32 @@
+
diff --git a/common/graph-nodes-2.svg b/common/graph-nodes-2.svg
new file mode 100644
index 0000000..8a2b9b9
--- /dev/null
+++ b/common/graph-nodes-2.svg
@@ -0,0 +1,13 @@
+