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In page Indo-European languages:

"
  • The voiced stops resulting from the sound shift were softened to voiced fricatives, or perhaps the sound shift directly generated fricatives in these positions.[citation needed]
  • Verner's law also turned some of the voiceless fricatives resulting from the sound shift into voiced fricatives or stops. This is why the t in Latin centum ends up as d in hund(red) rather than the expected th.