Because 'h' and 'kh' usually denote different sounds, the latter encodes https://en.wikipedia.org/wiki/Voiceless_velar_fricative https://en.wikipedia.org/wiki/V

Because 'h' and 'kh' usually denote different sounds, the latter encodes https://en.wikipedia.org/wiki/Voiceless_velar_fricative https://en.wikipedia.org/wiki/Voiceless_velar_fricative.