I tried this, of course, before asking, but:
group_concat(distinct(t.LastName || ', ' || t.FirstName), '; ') As Teachers, 
gives
[15:19:32] Error while executing SQL query on database 'test': DISTINCT 
aggregates must have exactly one argument

> To: sqlite-users at mailinglists.sqlite.org
> From: rsmith at rsweb.co.za
> Date: Thu, 8 Oct 2015 23:58:09 +0200
> Subject: Re: [sqlite] Can this be done in SQLite?
> 
> 
> 
> On 2015-10-08 11:47 PM, K. P. wrote:
> > Am using SQLiteStudio - which I really like - though I have wondered if it 
> > passes all its knowledge around errors onto the user...
> 
> I hope it does. Try some other ones too, just to get a wider idea. 
> Perhaps http://www.sqlc.rifin.co.za/ or http://www.sqliteexpert.com/ if 
> on Windows, or https://github.com/sqlitebrowser/sqlitebrowser if on 
> Linux/Mac.  If any of them do things that seem odd, and you are 
> comfortable using command line tools, the sqlite3 CLI is best for 
> checking/testing SQL at http://www.sqlite.org/download.html
> 
> As to your distinct question, sure, use like this:
> 
> SELECT group_concat(DISTINCT fullName) FROM sometable WHERE 1;
> 
> 
> 
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