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<p>matching against a list of valid (or invalid) items in an array and, in some programming languages, may include <a href="page.php?w=Pointer_%28computer_programming%29">pointer</a> functions (or offsets to labels) to process the matching input. <a href="page.php?w=Field-programmable_gate_array">FPGAs</a> also make extensive use of reconfigurable, hardware-implemented, lookup tables to provide programmable hardware functionality. LUTs differ from <a href="page.php?w=hash_table">hash table</a>s in that, to retrieve a value  with key , a hash table</p><p>
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