There is little chance that Emily is a mouse. It is probable that John dropped the apple. It is highly unlikely that Julius is a swan. It is probable that if 'Emily is a mouse and John dropped the apple' then Lily is a lion. It is highly unlikely that if either 'Julius is a swan' or 'John dropped the apple' but not both then Brian is a rhino. It is likely that if either 'Julius is a swan' or 'John dropped the apple' but not both then Greg is green.
Chances are about even that 'Greg is green' or 'Emily is a mouse' or both.
Chances are about even that 'Greg is green' or 'Emily is a mouse' or both.
There is almost no chance that 'Greg is green' or 'Emily is a mouse' or both.

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

  %hop2
  conclusion:-or(factZ,factA).

  query(conclusion).
  
'Greg is green' or 'Emily is a mouse' or both.