add euclid

repl/src/tutorial/tutorial.mdx

@@ -180,13 +180,13 @@ In essence, the `x!n` is like a shortcut for `[x*n]@n`.
 
 Compared to [tidal mini notation](https://tidalcycles.org/docs/patternlib/tutorials/mini_notation/), the following mini notation features are missing from Strudel:
 
-- Tie symbols "\_"
-- Euclidean algorithm "c3(3,2,1)"
-- feet marking "."
-- random choice "|"
-- Random removal "?"
-- Polymetric sequences "{ ... }"
-- Fixed steps using "%"
+- [x] Euclidean algorithm "c3(3,2,1)" TODO: document
+- [ ] Tie symbols "\_"
+- [ ] feet marking "."
+- [ ] random choice "|"
+- [ ] Random removal "?"
+- [ ] Polymetric sequences "{ ... }"
+- [ ] Fixed steps using "%"
 
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