A B C D E F G H?

M.  The names of the cross-streets travelling west on (say)
Commonwealth Avenue from Boston's Public Garden: Arlington, Berkeley,
Clarendon, Dartmouth, Exeter, Fairfield, Gloucester, Hereford,
Massachusetts Ave.  The alphabet does continue in the Fenway; after
Massachuetts Ave., there is Charlesgate, and then Ipswich, Jersey,
Kilmarnock.