Sigma
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Sigma (Greke σίγμα, skribita kom Σ, σ) esas dek-e-okesma litero di Greka alfabeto.

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From Wikipedia, the free encyclopedia
Sigma (Greke σίγμα, skribita kom Σ, σ) esas dek-e-okesma litero di Greka alfabeto.
Seamless Wikipedia browsing. On steroids.