In a plane there are two families of lines: \( y=x+r, y \)
P \( =-x...
In a plane there are two families of lines: \( y=x+r, y \)
P \( =-x+r \), where \( r \in\{0,1,2,3,4\} \). The number of the squares
W of the diagonal of length 2 formed by these lines is
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