*   Expressions are first converted the precedance preserved - EVALUATION PLAN
  *   The working of this algorithm is different from the typical algorithm fo expression evaluation
  *   Then it elimiates duplicates by storing them in DICTIONARIES
  *   Next, it increases the number of combination rows depending on the no of unique independant variables
  *   Alongside, this the evaluation of the plan to generate the results takes place
  *   Finally, a fully sorted results TRUTH-TABLE is generated in a DATAGRID
  *   THe evaluation plan can also be obtanined from the query - using which the user himself can produce the truth table