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Search syntax
s:d sort by date
r:uk uk region
site: domain search
\ search first result
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r:n turn off region
!a search search amazon
site:uk uk pages
f: find files
t: within title
b: within body
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Look-ahead (backtracking)
In backtracking algorithms, look ahead is the generic term for a subprocedure that attempts to foresee the effects of choosing a branching variable to evaluate or one of its values.
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Constraint satisfaction
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