Ann: Investor Conference Presentation, page-8

Uhm, I'm fairly sure I've used 5 sentences. Admittedly I might have added a comma in the second sentence after "doing", although some might argue that you don't use a comma before the word "and". If you're going to set out pick up people for spelling, punctuation or grammatical issues on a public forum, I dare say you're going to have your work cut out for you. In that case you should also make sure you use a comma before the word "but".