It is probably the case that John moved to the office. It is highly unlikely that Winona is a sheep. There is a very good chance that Jeff dropped the apple. There is a better than even chance that if either 'John moved to the office' or 'Jeff dropped the apple' but not both then Brian is a frog. There is a better than even chance that if either 'John moved to the office' or 'Winona is a sheep' but not both then Mary got the football. It is highly unlikely that if either 'Jeff dropped the apple' or 'Winona is a sheep' but not both then Jason is tired.
There is little chance that 'Brian is a frog and John moved to the office'.
There is little chance that 'Brian is a frog and John moved to the office'.
There is a better than even chance that 'Brian is a frog and John moved to the office'.

  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.
  0.05::factB.
  0.8::factC.
  %hop1
  0.6::factX:-xor(factA,factC).
  0.6::factY:-xor(factA,factB).
  0.05::factZ:-xor(factC,factB).

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

  query(conclusion).
  
'Brian is a frog and John moved to the office'.