don't drop downloads into a hash, just group by 2 and roll with it
don't drop downloads into a hash, just group by 2 and roll with it

rubygems/rubygems.org-backup,1337807/rubygems.org,dstrctrng/private_event,square/rubygems.org,1337807/rubygems.org,square/rubygems.org,rubygems/rubygems.org-backup,1337807/rubygems.org,rubygems/rubygems.org-backup,dstrctrng/private_event,square/rubygems.org