Type Esperanto using a postfix q to get the circumflex letter, e.g. cq -> ĉ, uq -> ŭ.
The first column is the character you will get in caps and the other columns say how to type it in caps or without caps.
|circumflex letter||digraph (upper case)||digraph (lower case)|
If you want to type just SQ in this system, you should use SQQ. E.g. cqq -> cq, Gqq -> Gq and SQQ -> SQ.