Please generate a travel time table between each pair of:  Alpha Centauri A, B, Proxima Centauri, Tau Ceti and the solar system. Assume  1 G acceleration to half way and 1 G deceleration to destination. Take speed of light into consideration. Output table as origen, destination, distance in LY or AU if less than 1 LY and travel time Provide the entire answer in JSON format.
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