It is highly likely that Bernhard is a swan. There is a very good chance that Greg is a frog. There is a very good chance that Emily is a sheep. There is a very good chance that if 'Emily is a sheep and Bernhard is a swan' then Daniel took the milk. It is probably the case that if either 'Emily is a sheep' or 'Bernhard is a swan' but not both then Sandra got the football. We doubt that if 'Emily is a sheep and Greg is a frog' then John put down the apple.
There is little chance that 'Bernhard is a swan and Sandra got the football'.
There is little chance that 'Bernhard is a swan and Sandra got the football'.
It is almost certain that 'Bernhard is a swan and Sandra got the football'.

  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
  0.9::factA.
  0.8::factB.
  0.8::factC.
  %hop1
  0.8::factX:-and(factC,factA).
  0.7::factY:-xor(factC,factA).
  0.2::factZ:-and(factC,factB).

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

  query(conclusion).
  
'Bernhard is a swan and Sandra got the football'.