The inflectional stem replaces ⟨-si⟩ with ⟨-te-⟩, which is subject to qualitative consonant gradation. Before the plural marker ⟨-i-⟩, the ⟨-s-⟩ is kept.
Partitive singular ending ⟨-ta⟩/⟨-tä⟩, eliding the ⟨-e-⟩, partitive plural ending ⟨-a⟩/⟨-ä⟩ and genitive plural ending ⟨-en⟩.