Enigma 91: Hidden gifts
From New Scientist #1235, 8th January 1981 [link]
“Beauty? Courage? Generosity? Patience? Wisdom? Which do you wish for the new-born Princess?” asked the Good Fairy.
“Beauty and Wisdom will do nicely, thank you,” replied the King, not wanting to seem greedy.
“Wait! For each gift you name, I shall bestow on her two of the other gifts instead. Each name of a gift triggers a different pair. Each gift is triggered by two of the names. But if you mention both names, they cancel out and she will not get that gift at all.”
“Coo, shiver my sceptre!” exclaimed His Majesty.
“Quite simple! For instance if you ask for Beauty and Courage, she will receive Generosity and Patience. If you ask for Beauty, Generosity and Patience, she will receive those three and Wisdom too. You in fact wished for Beauty and Wisdom. She shall have them, provided you ask for them in the simplest way.”
What gift or gifts should His Majesty ask for?