diff --git a/TODO.md b/TODO.md
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--- a/TODO.md
+++ b/TODO.md
@@ -1 +1,25 @@
 - add all other options like size etc
+
+
+- Patterns:
+
+A   Catagolue   textcensus   of,  say,   period-2   oscillators   from
+non-symmetrical soups can be found at
+
+https://catagolue.hatsya.com/textcensus/b3s23/C1/xp2
+
+The URL is made by just adding the prefix "text" to the word "census",
+in any URL linked to from a Catagolue census page such as this one:
+
+https://catagolue.hatsya.com/census/b3s23/C1
+
+Format:
+https://conwaylife.com/wiki/Apgcode
+
+
+Collections:
+
+https://entropymine.com/jason/life/
+https://github.com/Matthias-Merzenich/jslife-moving
+https://conwaylife.com/ref/mniemiec/lifepage.htm
+https://conwaylife.com/wiki/Spaceship ff.