It is certain that Jason is tired. It is unlikely that John went to the office. We believe that Julius is a lion. There is almost no chance that if 'Jason is tired and Julius is a lion' then Emily is a sheep. It is probably not the case that if either 'John went to the office' or 'Julius is a lion' but not both then Gertrude is a cat. There is little chance that if either 'Jason is tired' or 'Julius is a lion' but not both then Greg is gray.
It is almost certain that 'John went to the office and Emily is a sheep'.
It is impossible that 'John went to the office and Emily is a sheep'.
It is almost certain that 'John went to the office and Emily is a sheep'.

  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
  1.0::factA.
  0.2::factB.
  0.75::factC.
  %hop1
  0.02::factX:-and(factA,factC).
  0.25::factY:-xor(factB,factC).
  0.1::factZ:-xor(factA,factC).

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

  query(conclusion).
  
'John went to the office and Emily is a sheep'.