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The lines L(1),L(2),...,L(20) are distin...

The lines `L_(1),L_(2),...,L_(20)` are distinct.For `n=1,2,3,...,10` all the lines `L_(2n-1)` are parallel to each other and all the lines `L_(2n)` pass through a given point "P" .The maximum number of points of intersection of pairs of lines from the set `{L_(1),L_(2),...,L_(20)}` is equal to_____________.

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