It is probable that Greg is a lion. There is little chance that Jessica is a cat. We doubt that Brian is yellow. There is a better than even chance that if 'Jessica is a cat and Brian is yellow' then Winona is a mouse. It is certain that if 'Jessica is a cat and Greg is a lion' then Emily is a sheep. There is little chance that if 'Greg is a lion' or 'Brian is yellow' or both then John left the football.
It is impossible that 'Winona is a mouse' or 'Greg is a lion' or both.
It is probably the case that 'Winona is a mouse' or 'Greg is a lion' or both.
It is impossible that 'Winona is a mouse' or 'Greg is a lion' or both.

  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.
  0.1::factB.
  0.2::factC.
  %hop1
  0.6::factX:-and(factB,factC).
  1.0::factY:-and(factB,factA).
  0.1::factZ:-or(factA,factC).

  %hop2
  conclusion:-or(factX,factA).

  query(conclusion).
  
'Winona is a mouse' or 'Greg is a lion' or both.