logical
    The following is a list of functions in the category logical
| Function | Description | 
|---|---|
| and | Evaluates 0 or more boolean conditions returning boolean true if there are no conditions and boolean false if any condition evaluate to false. All conditions after the first false remain unevaluated. | 
| n_of | integer n specifies the number of boolean conditions that follow that must evaluate to true for boolean true to be returned. If n is 0, true is returned. Once n conditions evaluate to true, true is returned and the remaining conditions remain unevaluated. | 
| not | Evaluates boolean condition returning boolean true if condition evaluates to false and false if condition evaluates to true. | 
| or | Evaluates 0 or more boolean conditions returning boolean false if there are no conditions and boolean true if any condition evaluate to true. All conditions after the first true remain unevaluated. |