HDB may allow you to retain the flat until you have met the Minimum Occupation Period (MOP) respectively. This is up to HDB's discretion.
Hope this answers your question.
1) Whether an HDB flat can sell within MOP, it is HDB who has the final say.
2) Thus when there is a situation when there is an infringement of policy, you can guess what they will do. :-))
Hope the above answer to your main concerns, but if there are more query, please feel free to contact me at 90110636, or email: email@example.com if more information is needed.
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