You are welcome it's easy to type the wrong word or order of a word when your mind is on the plot, characters, and story. I have always struggled with screwing up letters and numbers so I think sometimes I find it easier to spot the in someone else work. The one time I don't is when I am anxious to more of the story or if I am tired when reading.
I am happy to help in any way I can I am the type of person that believes it constructive encouragement.