Key to error abbreviations:

X,          need to insert or delete a comma

X;          need to insert or delete a semi-colon and so on for all punctuation notations

X-          need to insert a hyphen or delete one

X cs       comma splice (run-on sentence)

X frag    sentence fragment

X mw    missing a word

p/a        pronoun antecedent disagreement

X par     all listed items/phrases need to be made parallel

X s         need an “s” or need to delete one

X sp       spelling error or wrong form of a number

X s/v     subject verb disagreement

X syn     syntax error: sentence difficult to understand due to word placements or grammatical errors or both

X uc      need to remove or include a capital letter

X vt       incorrect verb tense

X wf      correct word but incorrect form

X wc     word choice or wrong word

X wo     word order

X xw      extra word

X ww    wrong word