Exercise 12.15

State the interval-algebra relation that holds between every pair of the following real-world events:

$LK$: The life of President Kennedy.

$IK$: The infancy of President Kennedy.

$PK$: The presidency of President Kennedy.

$LJ$: The life of President Johnson.

$PJ$: The presidency of President Johnson.

$LO$: The life of President Obama.

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