NL-complete Problems
Several problems are known to be NL-complete under log-space reductions, including ST-connectivity and 2-satisfiability. ST-connectivity asks for nodes S and T in a directed graph whether T is reachable from S. 2-satisfiability asks, given a formula of which each clause is the disjunction of two literals, if there is a variable assignment that makes the formula true. An example instance, where indicates not, might be:
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