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== Unnamed refs are not merged
[1]
[2]
== Named refs are merged
[3]
[3]
== Differing content is bad
[4]
[4]
- ^ main content 1
- ^ main content 1
- ^ a b main content 2
- ^ a b main content 3a Invalid
<ref>
tag; name "”main-3”" defined multiple times with different content