So "應行" probably is ok with "離合聲韻字".
Just googled something about it but didn't open them.
It seems that "離合音字" and "離合聲韻字" are different (at least based some people's view).
So "應行" probably is ok with "離合聲韻字".
So "應行" probably is ok with "離合聲韻字".