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Le Petit Prince, Antoine de Saint-Exupery:

"Tu n'avais eu longtemps pour distraction que la douceur des couchers de soleil."

I know that "pas" is often replaced by some words like "plus", "rien", etc.  but what about this sentence? Where's "pas"? Is it replaced by another word? If so, which word replaced "pas"? :)

And how can you translate the sentence?

Thanks in advance.