R.O. == Run On Sentences
Frag == Sentence Fragments
Comma == Your general use of commas; comma splices
Awk == Awkward phrases or word usage
W.C. == Word Choice (you chose the wrong word)
Punct == Punctuation
Q.I. == Poor quote integration (interspersing the words of others with your own)
Redundancies == Using the same word or words over and over
S/V == Subject/Verb Agreement
Art == Article Usage (a/an; the)
Possessives == ‘s