Epimers are diastereomers that contain more than one chiral center but differ from each other in the absolute configuration at only one chiral center.
C2 epimer of D-glucose- D- Mannose
C3 epimer of D-glucose- D-Allose
C4 epimer of D-glucose- D-Indose
C2 epimer of D-altrose- D-Allose
C2 epimer of D-gulose- D-Indose