You are given: (i) The quoted ask (resp. bid) prices of a K-strike T-year call option and

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You are given: 

(i) The quoted ask (resp. bid) prices of a K-strike T-year call option and a K-strike T-year put option on the same stock are denoted by Ca(K, T) and Pa(K, T) (resp. Cb(K, T) and Pb(K, T)), respectively. 

(ii) The current ask and bid prices for the stock are Sa(0) and Sb(0), respectively. 

(iii) You can borrow at the rate rb and lend at the rate rl

(iv) The stock pays dividends continuously at a rate proportional to its price. The dividend yield is δ. 

Use no-arbitrage arguments to derive condition(s), in terms of the above symbols, under which you cannot profitably perform a parity arbitrage.

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