Its presence is certainly greatest in the resource-rich countries like Nigeria , Angola and Sudan -LRB- where its role has been criticized as contributing to the crisis in Darfur -RRB- .
Sudan /location/country/administrative_divisions Darfur
Darfur /location/administrative_division/country Sudan
Sudan /location/location/contains Darfur
PRP$ NN VBZ RB JJS IN DT JJ NNS IN NNP , NNP CC NNP -LRB- WRB PRP$ NN VBZ VBN VBN IN VBG TO DT NN IN NNP -RRB- .
Sudan
LOCATION
Darfur
LOCATION
/location/country/administrative_divisions
Darfur
LOCATION
Sudan
LOCATION
/location/administrative_division/country
Sudan
LOCATION
Darfur
LOCATION
/location/location/contains