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They lost contact with each other and after Dave escaped Richard became the new "slave"
yes
Robert is not realy talked about becasue he was never abused by his mother. the brothers have not seen each other since their mothers funeral.
each other
They hate each other that are boys or girls.
you should talk about what you have in common
no
The force preventing two materials in contact passing each other means that it's the same with magnets but they don't contact with each other.
boys can stay out late, but girls cannot
The boys hate each other
They shoot at each other
Sliding friction prevents surfaces in contact from sliding past each other.