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! Type in unicode polytonic Greek using beta code as indicated below:
/a => ά \a => ὰ =a => ᾶ )a => ἀ
(a => ἁ !a => ᾳ +i => ϊ h => η
q => θ x => χ c => ξ z = ζ
j => ψ w => ω s => σ, ς  
Combine punctuation marks when necessary e.g. )/a => ἄ
σύ

(sing. nom. σύ, gen. σοῦ, dat. σοί, ac. σέ; pl. nom. ὑμεῖς, gen. ὑμῶν, dat. ὑμῖν, ac. ὑμᾶς; dual nom. ac. σφῶϊ e σφώ, gen. dat. σφῶϊν e σφῷν) pron. pes. de 2a pes. tu; pl. vós.