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count(0, []).
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count(Count, [_|Tail]) :- count(TailCount, Tail), Count is TailCount + 1.
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sum(0, []).
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sum(Total, [Head|Tail]) :- sum(Sum, Tail), Total is Head + Sum.
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average(Average, List) :- sum(Sum, List), count(Count, List), Average is Sum/Count.
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