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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
ἀρνέομαι-οῦμαι

(impf. ἠρνούμην, fut. ἀρνήσομαι, aor. ἠρνήθην, perf. ἤρνημαι) 1 negar; refutar; desmentir 
2 dizer que não, or. inf., μή e inf., μή οὐ e inf. ou or. conj. (ὅτι οὐ, ὡς οὐ e ind.) ou part. 3 crist. renegar.