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.

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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