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Cheat Sheet

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pyDatalog syntax:
+ p(a)
p(X)<=q(X)&r(X)
print(q(X))
+(f[a]==b)
(s[X]==len(Y))<=p(X,Y)

Aggregate functions:
len(Y)
sum(Y,for_each=Z)
min(Y,order_by=Z)
rank(for_each=Y,order_by=Z)
concat(Y,order_by=Z,sep=',')
running_sum(N,for_each=Y,order_by=Z)

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