Σ
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Sigma (tōa-siá Σ, sió-siá σ) sī tē-18 ê hi-lia̍p jī-bó.
 | Pún bûn-chiuⁿ sī chi̍t phiⁿ phí-á-kiáⁿ. Lí thang tàu khok-chhiong lâi pang-chō͘ Wikipedia. |
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