How should I dispose side effect ?

hello ,
        I find Powerloom is able to new a few of objects and persist it into
memory when I execute retrieve command .
        Such as :


PL-USER |= (defconcept person)

|c|PERSON

PL-USER |= (defrelation age ((?x person)(?y integer)))

|r|AGE

PL-USER |= (defrule xxx (=> (person ?x) (age ?x 1)))

|P|(FORALL (?x)
   (<= (AGE ?x 1)
       (PERSON ?x)))

PL-USER |= (assert (person p))

|P|(PERSON P)

PL-USER |= (retrieve all (age ?x ?y))

There is 1 solution:
  #1: ?X=P, ?Y=1

PL-USER |= (retrieve all (age ?x ?y))

There is 1 solution:
  #1: ?X=P, ?Y=1

     Powerloom make a duplicate of xxx's description ,save it in it's
homeModule's dynamicSlot and xxx's description for more retrieve when I
first execute retrieve command about relation age .

     I want Powerloom not save the duplicate into memory .How should I
dispose this side effect ?


Thanks

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