8. The non-transitory computer-readable medium of claim 7 , wherein the complexity score calculation algorithm calculates a temporary score for the retrieved keywords, mathematical operators, and logical operators.
8. The non-transitory computer-readable medium of claim 7 , wherein the complexity score calculation algorithm calculates a temporary score for the retrieved keywords, mathematical operators, and logical operators. 11. The non-transitory computer-readable medium of claim 8 , wherein the temporary score for each mathematical operator is equal to a product of a number of occurrences of the mathematical operator and a variable complexity factor or a product of a number of occurrences of the logical operator and a variable complexity factor.