Friends(Anna, Bob)
Friends(Bob, Anna)
Friends(Anna, Edward)
Friends(Edward, Anna)
Friends(Anna, Frank)
Friends(Frank, Anna)
Friends(Bob, Chris)
Friends(Chris, Bob)
Friends(Chris, Daniel)
Friends(Daniel, Chris)
Friends(Edward, Frank)
Friends(Frank, Edward)
Friends(Gary, Helen)
Friends(Helen, Gary)
Friends(Gary, Anna)
Friends(Anna, Gary)

Smokes(Anna)
Smokes(Edward)
Smokes(Frank)
Smokes(Gary)

Cancer(Anna)
Cancer(Edward)