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Is it true what my french book told me:
0. You can/must be late 10-15 minutes
1. no talking about job/quality of food/politics/religion in a dinner
2. wine can only be consumed after cleaning mouth sides with a table napkin
3. after dinner, the fork and knife must be at 5 o'clock, fork pointing towards plate, knife edge pointing towards yourself, behind the fork
4. thank only for the company, not the food