Thank you. I do point out (in private notes) sometimes when someone does make an obvious error (it's for its, for example) in order for that person to not be assumed an uneducated idiot. I got a sever keyboard lashing for it, though, so now I'll just let the assumed idiots run wild. I taught writing and grammar for 34 years at several community colleges. I felt I was giving the students something helpful. And I included "a" and "an."