E Letter Prison does not correspond to any known location or entity in Singapore. It appears to be an unfamiliar or possibly fictional term with no relevant connection to Singapore.

Additional information would be needed to accurately describe or explain E Letter Prison. More context is necessary to generate a relevant article.

If the term relates to a correctional facility, none by this name exists in Singapore’s prison system. For topics related to Singapore’s correctional services, other official terms and website locations are used.

Please clarify or specify your request so I can assist you better with accurate information.