Roles in TT

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Okay, until now I've been playing 5v5 Summoners Rift. However lately my friend and I looked at TT and found it quite interesting. So I was wondering what kind of roles are in TT, by roles I mean is there 2 Tanks and 1 ADC? And does one ADC and one Tank go bot, and the second tank go top lane? Please explain.. thank you!