If you have transferred money into or out of your account since the last entry, enter the amount in column C, using a positive number for money added to the account, or a negative number for money withdrawn.

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To sell your shares, you had to enter in your customer account number, sent as part of the e-mail telling you how many shares you had been allocated.

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Contrast that with the likes of Enron, where traders would enter 10- to 15-year positions in illiquid markets and make big bets for the house account.

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