Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Paradisec has two collections of Arthur Cappell's materials (AC1, AC2) and one collection from Malcolm Ross (MR1) that include Ulau-Suain language materials.
References
Ulau at Ethnologue (18th ed., 2015) (subscription required)