diff --git a/notsof.md b/notsof.md
index 3ebc88110..c3650084c 100644
--- a/notsof.md
+++ b/notsof.md
@@ -81,6 +81,8 @@
   - a constructive diagram can often *precede* the knowledge which explains its shape
   - [[aside]]
     - [[visual cortex]], [[eric weinstein]]
+- "the program is a hierarchy of the most significant subsets of M"
+  -  this is looking more and more like a [[partitioning]] problem