It is probably the case that Fred discarded the apple. There is a very good chance that Julius is a rhino. It is unlikely that Emily is a sheep. There is little chance that if 'Fred discarded the apple' or 'Julius is a rhino' or both then Brian is green. It is improbable that if 'Fred discarded the apple and Julius is a rhino' then Sandra left the football. It is almost certain that if 'Julius is a rhino' or 'Emily is a sheep' or both then Bill went to the garden.
It is probably the case that 'Emily is a sheep and Julius is a rhino'.
It is unlikely that 'Emily is a sheep and Julius is a rhino'.
It is probably the case that 'Emily is a sheep and Julius is a rhino'.

  and(A,B) :- A,B.
  or(A,B) :- A;B.
  nand(A,B) :- not(and(A,B)).
  nor(A,B) :- not(or(A,B)).
  xor(A,B) :- or(A,B), nand(A,B).

  %hop0
  0.7::factA.
  0.8::factB.
  0.2::factC.
  %hop1
  0.1::factX:-or(factA,factB).
  0.1::factY:-and(factA,factB).
  0.95::factZ:-or(factB,factC).

  %hop2
  conclusion:-and(factC,factB).

  query(conclusion).
  
'Emily is a sheep and Julius is a rhino'.