While everyone and their brother on the internet i... ...ight: the discussion includes a categorization of astromech droids, the R-series, possible reasons for the sp...
https://www.neatorama.com/2014/11/30/A-Deep-Look-At-The-Droid-In-The-New-Star-Wars-Trailer/
A Deep Look At The Droid In The New Star Wars Trailer...
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