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examples/o2o2types/README.md

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+# User-Card O2O Relation Example
+
+An example for a O2O relation between a User and Card.  
+In the example, a User can have only one card, and a card must have exactly one owner (required edge).
+
+### Generate Assets
+
+```console
+go generate ./...
+```
+
+### Run Examples
+```console
+go test
+```