The Bank of Canada often releases some prefixes well ahead of the rest of them such as this case of ERC being out well ahead of the tail end of the EL- series. The remainder will all get filled in sooner or later. It all depends on how long it takes for the supply of notes to be exhausted.
Logged
BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.