It is probable that Bill got the milk there. There is little chance that Emily is a mouse. It is impossible that Lily is a frog. Chances are about even that if either 'Emily is a mouse' or 'Bill got the milk there' but not both then Jeff left the apple. It is highly likely that if either 'Emily is a mouse' or 'Lily is a frog' but not both then Mary went to the bedroom. It is probably the case that if 'Lily is a frog' or 'Emily is a mouse' or both then Bernhard is yellow.
It is almost certain that 'Bernhard is yellow and Emily is a mouse'.
It is highly unlikely that 'Bernhard is yellow and Emily is a mouse'.
It is almost certain that 'Bernhard is yellow and Emily is a mouse'.

  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.
  0.0::factC.
  %hop1
  0.5::factX:-xor(factB,factA).
  0.9::factY:-xor(factB,factC).
  0.7::factZ:-or(factC,factB).

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

  query(conclusion).
  
'Bernhard is yellow and Emily is a mouse'.