✈️ SIN → LHR
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Gate C23
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CHANGI AIRPORT
sin lhr
  [
    {"relatedness": False, "type": "none", "explanation": "This is not related to public housing or maintenance issues."},
    ]

It seems that the Twitter post "sin lhr" does not relate to a maintenance report feedback to a public flat house. It is not clear what this abbreviation or term means, and without more context, it is difficult to provide a more specific answer. If you have any additional information or context about the post, please let me know and I will do my best to assist you.