8 lines
220 B
Prolog
8 lines
220 B
Prolog
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% Dracula is a vampire.
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% Also, you become a vampire if someone who is a vampire bites you.
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vampire(dracula).
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vampire(You) :- bites(Someone, You), vampire(Someone).
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% Oh no! Dracula just bit Bob...
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bites(dracula, bob).
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