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Only a few Calls is Trades (I) + Some Trades are Margins (I) → No conclusion. Hence conclusion I does not follow. Only a few Calls is Trades (I) + No Trades is Pledge (E) → Some Calls are not Pledge (O) → Probable conclusion → All Pledge may be Calls (I). Hence conclusion II follows. Some Trades are Margins (I) → Conversion → Some Margins are Trades (I) + No Trade is Pledge (E) → Some Margins are not Pledge (O). Hence conclusion III does not follow.