It is impossible that Greg is a frog. There is a better than even chance that Mary went to the bedroom. There is a very good chance that Lily is a frog. There is little chance that if either 'Lily is a frog' or 'Mary went to the bedroom' but not both then Jeff left the apple. It is likely that if either 'Lily is a frog' or 'Mary went to the bedroom' but not both then Bernhard is a swan. There is a better than even chance that if 'Mary went to the bedroom' or 'Lily is a frog' or both then Brian is gray.
Chances are about even that 'Lily is a frog and Mary went to the bedroom'.
Chances are about even that 'Lily is a frog and Mary went to the bedroom'.
It is highly unlikely that 'Lily is a frog and Mary went to the bedroom'.

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

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

  query(conclusion).
  
'Lily is a frog and Mary went to the bedroom'.