1. An apparatus comprising: a written input device; a processor; a memory that stores code executable by the processor, the code comprising: code that detects a sub-logogram from a written input to the written input device; code that displays one or more logogram hints in response to detecting the sub-logogram, wherein each logogram hint comprises the sub-logogram and one or more subsequent sub-logograms of a logogram sequence of a plurality of sub-logograms; code that detects a sub-logogram error from a difference between the written input and a given sub-logogram of the logogram sequence by comparing a first Unicode representation order corresponding to the logogram sequence with a second Unicode representation order corresponding to the written input; and code that displays the logogram sequence in response to detecting the sub-logogram error, wherein displaying the logogram sequence comprises displaying a plurality of strokes in sequential order based on the first Unicode representation order for writing the plurality of sub-logograms.