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Vaatleme järgmist grammatikat:
E → EEE → E+EE → xE → f
Milised on korrektsed paremderivatsioonid?
E ⟹ EE ⟹ EE+E ⟹ EE+x ⟹ Ef+x ⟹ xf+x
E ⟹ EE ⟹ Ef ⟹ E+Ef ⟹ E+xf ⟹ x+xf
E ⟹ EE ⟹ EE+E ⟹ EE+x ⟹ fE+x ⟹ fx+x
E ⟹ E+E ⟹ EE+E ⟹ EE+x ⟹ Ex+x ⟹ fx+x
E ⟹ E+E ⟹ E+x ⟹ EE+x ⟹ Ex+x ⟹ fx+x
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