6 6 2 0

person1 Person
person2 Person
city1 City
city2 City
comment Comment
message Comment

a person1 person2 knows
b person1 city1 isLocatedIn
c person2 city2 isLocatedIn
d comment person1 hasCreator
e message person2 hasCreator
f comment message replyOf

city1 id =1342
city2 id =1127