Natural numbers only include zero if you define it so in the beginning of your book/paper/whatever. Otherwise it’s ambiguous and you should be ashamed of yourself.

So in order to get a gun Americans need to have training (like driver’s education)?

Russia built the bridge after it invaded Crimea in 2014 by the way

Keep in mind in Germany this only applies to children making 100,000€ per year or more with impoverished parents provided the parents did not abuse the children. If you can prove you were abused and it would be an undue hardship to provide support then you can be exempted.

But the tag “Foursome - M/M/M/M” very much contains the letter “F”. It’s why that first F is highlighted in the shown tags.