diff --git a/systems.md b/systems.md
index cf63049c0..7edfcce1e 100644
--- a/systems.md
+++ b/systems.md
@@ -1,2 +1,3 @@
-- [[pull]] [[stpa]]
-- [[pull]] [[processes]] i na 
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+- [[wholes]] integrated out of interacting [[components]].
+	- can be modelled as a graph of [[processes]]
+		- [[pull]] [[stpa]]
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