In "Strine", the national language of "Straya":
Hello = G'day mate
Thanks = Onya!
Goodbye = Hooroo
"Onya" is a bit problematic, as if said with rising inflection, it means "thanks", but if said with a negative inflection, it means "You have just made an inexcusable error, Drongo!"
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John, VK4TJ, adapting to life in my adopted country of "Straya".