Determine which legal clause the following paragraph belongs to: ( i)  if it has paid the Purchase Price to Seller, require Seller immediately to repay the sum so paid;  ( ii)  if Buyer has a Transaction Exposure to Seller in respect of the relevant Transaction,  require Seller from time to time to pay Cash Margin atleast equal to such Transaction Exposure;  ( ii)  at anytime while such failure continues, terminate the Transaction by giving written notice to Seller. On such termination the obligations of Seller and Buyer with respect to delivery of Purchased Securities and Equivalent Securities shall terminate and Seller shall pay to Buyer an amount equal to the excess of the Repurchase Price at the date of Termination over the Purchase Price.