Seimat has a quinary numeral system; numbers from one to five are unique, whereas most all other numbers are simply combinations of these. For example, numbers from six to nine are compounds based on five, combined with the words for one to four. Twenty is also a unique word, meaning "person"; it presumably refers to a full set of fingers and toes.[5]
Wozna, B.; Wilson, T. (2005), Seimat Grammar Essentials(PDF), Data Papers on Papua New Guinea Languages, volume 48, Ukarumpa, Papua New Guinea: Summer Institute of Linguistics