Unique item stacks

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I was wondering...how do unique effects stack? In the learning center it explains on auras that you can only have 2 of same kind on max and that's only if you're the one providing one of the aura.
Otherwise you'd get only one.

But it neglects item effects other then auras.
Does lichbane and sheen and trinity force stack? why and how?
Does sword of the divine stack with twisted fate's stacked deck?

...and so on.
Just the rules would be fine.(or a link to them)