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[It's pretty refreshing to talk to people that doesn't immediately give him weird looks or plain tells him to shut up when he's on a ramble. Atsuro gets bonus points for curiosity!]
Well... a case very rarely reaches our desk unless the local authorities are having trouble solving it themselves, so in a way you could say all the cases we deal with are tough. Relatively speaking though, there's been a fair few that were more challenging than others.