In the following figure, \(BLUE\) is a parallelogram with \(O\) is the point where the diagonals meets and \(OU = 11, OE = 8, OL = n-5\) and \(OB = m-n\). Also, determine the diagonal values.
1. The value of '\(m\)' \(=\) .
2. The value of '\(n\)' \(=\) .
3. Measure of the diagonal \(BU\) \(=\) .
4. Measure of the diagonal \(LE\) \(=\) .