What is the masculine u form for the old Swedish word with a neuter a form of skipum?
CREATE TABLE table_name_68 (
    masculine_u_stems VARCHAR,
    neuter_a_stems VARCHAR
)
SELECT masculine_u_stems FROM table_name_68 WHERE neuter_a_stems = "skipum"
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 the masculine u form for the old Swedish word with a neuter a form of skipum? ### Input: CREATE TABLE table_name_68 (
    masculine_u_stems VARCHAR,
    neuter_a_stems VARCHAR
) ### Response: SELECT masculine_u_stems FROM table_name_68 WHERE neuter_a_stems = "skipum"