# Tabling

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**Tabling** is a solving technique which is not used by human players but by computer programs. The program builds a table of implications for the **true** and **false** states of each remaining candidate in the grid.

The primary aim of tabling is to find a candidate that causes a contradiction. The program can then build a chain that proves this contradiction.

Alternatively, the tables can be used to find verities, which are implications that occur for all alternative candidates in a constraint. Since multiple chains are required to prove a **verity**, this aspect of tabling is only used when no contradictions can be found.