JESS: define Uncle rule

[The Boy]

Hello all,
how I can define the equivalence of this rule ?x hasFather ?y ∧ ?y
hasBrother ?z => ?x hasUncle ?z
in Jess/CLIPS . I assume that ?x, ?y and ?z are instances of class Person;
and class Person has 3 slots (hasBroher with type Instance,hasFather with
type Instance ,hasUncle with type Instance)

Thanks in advance.

Joe_
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