There is a very good chance that Mary went to the kitchen. It is probable that Jeff moved to the office. There is little chance that Brian is a swan. It is likely that if either 'Jeff moved to the office' or 'Mary went to the kitchen' but not both then Gertrude is a cat. Chances are slight that if 'Jeff moved to the office' or 'Brian is a swan' or both then Winona is a mouse. It is probably the case that if either 'Brian is a swan' or 'Mary went to the kitchen' but not both then Lily is a rhino.
It is probably the case that 'Mary went to the kitchen and Brian is a swan'.
It is improbable that 'Mary went to the kitchen and Brian is a swan'.
It is probably the case that 'Mary went to the kitchen and Brian is a swan'.

  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
  0.8::factA.
  0.7::factB.
  0.1::factC.
  %hop1
  0.7::factX:-xor(factB,factA).
  0.1::factY:-or(factB,factC).
  0.7::factZ:-xor(factC,factA).

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

  query(conclusion).
  
'Mary went to the kitchen and Brian is a swan'.