How many possible stereoisomers are there of the following heptose? 
Definitions:
Voter Preference
The inclination or predisposition of voters towards certain candidates, parties, or policies in an election.
Facial Features
Distinct attributes of the face such as eyes, nose, and mouth that contribute to individual recognition and expression interpretation.
Mere Exposure Effect
A psychological phenomenon whereby individuals develop a preference for things merely because they are familiar with them.
Reciprocity Norm
An expectation that people will help, not hurt, those who have helped them.
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