1. No problem
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    At a store buying a pack of gum (and beer) you hand over the $ to cashier. Cashier hands you the change, you say "thank you" cashier says "no problem". Should you have been concerned the cashier was not going to give you the change? Guess so. "No problem" has done away with "you're welcome"
  2. No worries
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    At work, you ask an intern to take a stack of rundowns to the controll room, intern says "no worries". Should you be concerned that the task was too much for the intern? Guess so. NOTE: intern not Australian nor have they ever met someone from Australia.