while IFS=$'\t' read -r objname objhash ; do
  ext=${objname##*.}
  objpath="${objhash:0:1}/${objhash:1:1}/${objhash:2:1}/${objhash}.${ext,,}"
  container="wikipedia-commons-local-deleted.${objhash:0:2}"
  swift download -o "album_covers/${objname}" "${container}" "${objpath}"
done < album_covers_hashes