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20! ÷ 2 = 1,216,451,004,088,320,000
“But that's . . .” Laurie said, counting the commas, “over one million million
million
paths!”
“One of those umpty-million paths is the shortest,” Tinker said. “I don't know of any way to
find it quickly.”
“I'll be old before we check them all! Isn't there a better way to do it?”
“Ah, that's the good news!” Tinker said. “I deal only in Exact answers. But there is a brilliant
Composer who lives in Permute, named Hugh Rustic. He deals in Good Enough answers. I
send him all of my hardest cases. I'll write an IOU that you can take to him.”
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