There is almost no chance that Brian is a rhino. It is probable that Jessica is a sheep. It is likely that Greg is white. It is probable that if either 'Greg is white' or 'Brian is a rhino' but not both then Lily is a swan. We doubt that if 'Brian is a rhino and Greg is white' then Julius is yellow. There is little chance that if 'Greg is white and Jessica is a sheep' then John left the football.
It is probable that 'John left the football and Brian is a rhino'.
It is impossible that 'John left the football and Brian is a rhino'.
It is probable that 'John left the football and Brian is a rhino'.

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

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

  query(conclusion).
  
'John left the football and Brian is a rhino'.