Good to read your outline. but a few points to be kept in mind, that how would you incorporate the conditions imposed by the papers setter of the Essay, for example, Essay should be, Narrative, Descriptive, Exposition touch, (Obviously Argumentative touch you already have given to it) but what about the remaining conditions. what have you thought about these points???
keep it in your mind that a major cause of the failure in Essay is merely following the Argumentative method while neglecting the other above mentioned conditions for an Essay in CSS......
Do think about it.....

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