What is who-two when you two is ngipelngu?
CREATE TABLE table_15994 (
    "Case/Suffix" text,
    "we two" text,
    "you and I" text,
    "you two" text,
    "them two (the two)" text,
    "who-two" text
)
SELECT "who-two" FROM table_15994 WHERE "you two" = 'ngipelngu'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is who-two when you two is ngipelngu? ### Input: CREATE TABLE table_15994 (
    "Case/Suffix" text,
    "we two" text,
    "you and I" text,
    "you two" text,
    "them two (the two)" text,
    "who-two" text
) ### Response: SELECT "who-two" FROM table_15994 WHERE "you two" = 'ngipelngu'