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ご馳走
ごちそう
Gochisou
Great Meal

ごちそうですね。
Gochisou Desune.
This is a great meal.

ごちそう　さま
Gochsou sama
Thank you for a great meal
Thank you for buying the meal

ごちそうします
Gochisou Shimasu
I am buying the meal.