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There are an infinite number of them. All you have to do is write down a pair of curly brackets facing each other, and you have an empty set.
It would be difficult because they tend to eat each other
people find it difficult to be united because they are different from each other
No. This is complete nonsense.No. This is complete nonsense.
As there is no air , it is difficult , but astronauts use radios.
The will to survive
ambot
Peter and Anne Frank promised to be honest with each other and to support each other during their time in hiding. They also promised to keep each other's secrets and be there for each other during difficult times.
The electromagnetic field surrounding each atom repels all other atoms.
Each router builds a complete and synchronized view of the network.
The sizes of the mountains make trade difficult.
no they cant they have to be the same they complete each other