Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 7.2.3)
Copyright (c) 1990-2015 University of Amsterdam, VU Amsterdam
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
Please visit http://www.swi-prolog.org for details.

For help, use ?- help(Topic). or ?- apropos(Word).


true.

Hamster.............................4.00
Twinkies............................0.75
Hamster.............................4.00
Deluxe Toast-a-matic...............14.00
----------------------------------------
Total                             $22.75
true.


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