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Which is closest to how you are most apt to think of the universe's timeline:
bounded interval with definite beginning and end?
half-bounded, with a definite beginning but no end?
or with a definite end but no beginning?
infinite in both directions, no beginning and no end?
bounded interval with definite beginning and end?
half-bounded, with a definite beginning but no end?
or with a definite end but no beginning?
infinite in both directions, no beginning and no end?