git submodule delete?

[Rich Pixley <rich.pixley@xxxxxxxx>]

How do I remove a submodule?

Put another way, I've made a commit pointing to a nonexistent submodule 
commit.  And the submodule commit is now lost.  Can I manually force the 
submodule commit to the previous value?  Or can I remove the submodule 
and re-add it with an existing value?

--rich
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