 The consonant system had a two-way contrast of stop consonants (fortis vs. lenis), "k, p, t" vs. "g, b, d".There was also an affricate consonant, "č"; at least one sibilant "s" and sonorants "m, n, ń, ŋ, r, ŕ, l, ĺ" with a full series of nasal consonants.The sounds denoted by "ń, ĺ, ŕ" refer to palatalized sounds and have been claimed by Altaicists to be direct inheritances from Proto-Altaic.