TODO.md: add ideas

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diff --git a/TODO.md b/TODO.md
index 8e657e1..b39003a 100644
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+++ b/TODO.md
@@ -196,6 +196,12 @@ this stuff may not make any sense.
   https://eli.thegreenplace.net/2021/a-comprehensive-guide-to-go-generate/
   https://github.com/KhronosGroup/OpenCL-Docs/blob/main/xml/cl.xml
 * duktape vs quickjs (vs mujs?)
+* math: multinomial (stars and bars, # of moves on a chess board,
+  multinomial coefficient, etc), de moir dice problem
+  <https://en.wikipedia.org/wiki/Stars_and_bars_(combinatorics)>
+  ref: Introduction to Probability with Statistical Applications, ch 2.5
+  1e10/81 (1234567890.1234567890)
+* fzf, ripgrep
 
 ## done
 * add project folders