Nevertheless, I think you will understand that to one not accustomed to committing such errors, this development was rather disturbing, and I did in fact begin to entertain all sorts of alarmist theories as to their cause. 
As so often occurs in these situations, I had become blind to the obvious &dash. that is, until my pondering over the implications of Miss Kenton's letter finally opened my eyes to the simple truth: that these small errors of recent months have <tag "515648">derived</> from nothing more sinister than a faulty staff plan.  

