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There are unions where people are sexually mated but have en - tirely different characteristics in other respects and vice versa . There are points where our interests coincide in the search for a solution to the problem of Namibia 's independence and the problem of southern Africa in general - - how to avoid its becoming a zone of tension and conflict - - on which France and Cuba have coinciding positions . There are cryptosystems where encryption and decryption are done using separate keys , and it is not possible to derive the decryption key from the encryption key . There are conferences where everybody is playing man-to-man , and teams in those leagues can be at a disadvantage if they face some sort of zone upon reaching the NCAA Tournament . There are reports where patients have undergone heart transplants due to the irreversible nature of this disease in those 20 % of patients . There are points where it 's reasonable to draw a line and stand up for a principle .