Resulting Plan
Start
SFO
United
End
ua
sfo, To
From, To
sfo, To
sfo
+
q(sfo,To) <=> sfo ($ua,N,To)
q(sfo,To) <=> united (N,$sfo,To)
q(From,To) <=> q(A,From) & united (N,$From,To)
United
select
From
From, To
q
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