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diff --git a/openpgp/tests/data/wot/roundabout/README.md b/openpgp/tests/data/wot/roundabout/README.md
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+The best way from A to B, G and H is via C-D-E-F.  The best way from A
+to I is via B!  (A has two local optima.)
+
+J complicates things a bit when doing a backwards propagation.
+
+```
+        A
+        | \  6,120
+        |  C
+        |  |  5,120
+        |  D
+100,60  |  |  4,120      5,100
+        |  E <----------------- J
+        |  | 3,120              |
+        |  F                    |
+        v /  2,120              | 1,100
+        B                       |
+ 2,120  |                       |
+        v                       |
+        G <---------------------'
+ 1,120  |
+        v
+        H
+ 0,120  |
+        v
+        I
+```