7 9 1 3

c Person
a Person
b Person
city_c City
city_a City
city_b City
country Country

_a c a knows
_b c city_c isLocatedIn
_c c b knows
_d a b knows
_e a city_a isLocatedIn
_f b city_b isLocatedIn
_g city_a country isPartOf
_h city_b country isPartOf
_i city_c country isPartOf

country name ='China'

_a creationDate >=1284505856158
_c creationDate >=1282382587409
_d creationDate >=1281681940915