return levels/2 for now, while 10 levels
return levels/2 for now, while 10 levels

Impactstory/oadoi,Impactstory/citeas-api,Impactstory/oadoi,Impactstory/impactstory-tng,Impactstory/sherlockoa,Impactstory/impactstory-tng,Impactstory/impactstory-tng,Impactstory/sherlockoa,Impactstory/citeas-api,Impactstory/citeas-api,Impactstory/oadoi