Thank you for the reply.
I also read this discussion,
and found quite interestingly "14:A" , "14^A", "14&A" can hit a note which contains "あ(14A)が".
"14(A", "14.A", "14_A" do not work, but Colon, Hat can be replaced by other punctuation characters such as Hash, Question, Exclamation, Brackets, Dash, etc.
Thank you again. This technic is enough for me.