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SQL
select cl_sortkey_prefix from categorylinks a where a.cl_to = "All_extensions" and not exists ( select 1 from categorylinks b where b.cl_from = a.cl_from and b.cl_to in ( "Extensions_which_host_their_code_in-wiki", "Extensions_in_GitHub_version_control", "Extensions_in_Wikimedia_version_control", "Extensions_in_Google_Code_version_control", "Extensions_in_SourceForge_version_control", "Extensions_in_BitBucket_version_control" ) )
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