Start an investigation into affiliated keyword behavior.

notes/affiliated_keyword_investigation/test_document.org

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+# Single instance
+#+foo: *a*
+#+begin_example
+
+#+end_example
+
+# Two instances
+#+foo: *b*
+#+foo: *c*
+#+begin_example
+
+#+end_example
+
+# Single with optval
+#+foo[*bar*]: *d*
+#+begin_example
+
+#+end_example
+
+# Two with optval
+#+foo[*bar*]: *e*
+#+foo[*bar*]: *f*
+#+begin_example
+
+#+end_example