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heey guys , its been bothering me for a while ...

I've been rewatching skypiea's arc and when gon fall mentiond enel he said that 6 years ago he came to skypiea with his men and its his first time seeing the mantra , and when rayleigh started to explain to luffy the kenbunshoku haki he mentioned that they call it mantra in skpiea ..... my Q is how the hell did rayleigh know that they call the kenbunshoku haki - mantra in skypiea, since he and roger visited skypiea 22-26 years ago ?