NLI: Function: and/&

Background: NLI, Expressions, Functions
Related: Examples

The and function gets things that are common among sub-expressions.
The and function requires two or more sub-expressions.

General Format:
(and expr1 expr2 [expr3] ...)
(& expr1 expr2 [expr3] ...)

(; Get persons whose gender is male)
(and (get person instance *)
     (get * gender male))

(; Get cats that john likes)
(and (get cat instance *)
     (get john like *))
(; Get verbs that relate john to mary)
(& (get verb instance *)
   (get john * mary))

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