(bfr-and x1 x2 ...) constructs the AND of these BFRs.
Macro: bfr-and
(defmacro bfr-and (&rest args) (cons 'mbe (cons ':logic (cons (bfr-and-macro-logic-part args) (cons ':exec (cons (bfr-and-macro-exec-part args) 'nil))))))