Jan Burse, created May 21. 2019
* Prolog text aggreg from Chat80 as a module.
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* Obtained rights comment in Prolog text and text from LICENSE file:
* @(#)aggreg.pl 24.1 2/23/88
* Copyright 1986, Fernando C.N. Pereira and David H.D. Warren,
* All Rights Reserved
* This program may be used, copied, altered or included in other programs
* only for academic purposes and provided that the authorship of the
* initial program is acknowledged. Use for commercial purposes without the
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% :- mode aggregate(+,+,?),
million, 1, 1000).
thousand, 1000, 1).
sqmiles, 1000, 1).
ksqmiles, 1, 1000).