Original sentence: Big Four law firms (Japan).Big Six.Magic Circle (law).Offshore magic circle.Red Circle (law).Seven Sisters (law firms).White shoe firm
Edited sentence: Big Four - considered to be the leading law firms based in Japan.Big Six - considered to be the six leading law firms based in Australia.Global Quartet or Big Four - members of the Magic Circle other than Slaughter and May as it has, in general, not pursued a policy of expansion.Magic Circle - considered to be the five leading law firms based in the United Kingdom.Offshore magic circle - considered to be the leading offshore law fims.Red Circle - considered to be the leading law firms based in China.Seven Sisters, referring to the seven Canadian law firms considered to be the top tier.White shoe firms or Charmed Circle - considered to be the leading law firms based in New York City