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This is a personal website/weblog with no commercial purposes. All contents are personal notes/thoughts. However, some figures/texts may be copyrighted materials; references are indicated though. Personal notes/thoughts by empty-set are not subjected to copyright; hence, they are free to be downloaded/reused with/without a reference/permission. Figures, if not otherwise stated, are created by empty-set and are free to be downloaded/reused with/without a reference/permission. Posts are dynamic and any post may be updated any time.