Kio estas la diferencoj inter "tiu ĉi" kaj "ĉi tiu"
Same with ĉi tie and tie ĉi :)
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No difference as far as i can tell though i seem to hear (and read) ĉi tiu / ĉi tie more often. Don't know why, maybe it just trips off the tongue more easily
To be fair, there are cases when one is better than the other. -check out this video by Alex Miller for some pointers
There isn't really a difference, but usually you would say "ĉi tiu", while you could also say "tiu ĉi" if, to you, that sounds better in that sentence. I, for example, am using "tio ĉi" in a song I'm translating, because that sounds better due to the ending of the sentence before it.