It is likely that Emily is a sheep. It is almost certain that Mary picked up the apple. It is unlikely that Greg is a frog. There is a very good chance that if either 'Greg is a frog' or 'Emily is a sheep' but not both then Bernhard is a rhino. There is little chance that if 'Greg is a frog and Mary picked up the apple' then Julius is green. It is unlikely that if 'Emily is a sheep' or 'Greg is a frog' or both then John left the football.
It is highly unlikely that 'John left the football and Greg is a frog'.
It is highly unlikely that 'John left the football and Greg is a frog'.
It is highly likely that 'John left the football and Greg is a frog'.

  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.
  0.95::factB.
  0.2::factC.
  %hop1
  0.8::factX:-xor(factC,factA).
  0.1::factY:-and(factC,factB).
  0.2::factZ:-or(factA,factC).

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

  query(conclusion).
  
'John left the football and Greg is a frog'.