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One of the frustrating things when we were traveling in SEA was using US currency. Some places prefer it, but all the places require that it was in mint condition. I ended up taking a photo of a 10 $ bill that was refused by over a dozen people in 4 countries because it was missing a small piece. I'm not sure why they wouldn't take it because in north america it wouldn't be a problem using it. Mostly it was a pain because people wouldn't want to give change for a 20, and they wouldn't accept a 10 like that, so you get a bit stuck.