Which Works number has a Builder of avonside engine company, and a Type of 4-6-0, and a Number smaller than 12, and a Date of december 1871?
CREATE TABLE table_39906 (
    "Number" real,
    "Builder" text,
    "Type" text,
    "Date" text,
    "Works number" text
)
SELECT "Works number" FROM table_39906 WHERE "Builder" = 'avonside engine company' AND "Type" = '4-6-0' AND "Number" < '12' AND "Date" = 'december 1871'
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: Which Works number has a Builder of avonside engine company, and a Type of 4-6-0, and a Number smaller than 12, and a Date of december 1871? ### Input: CREATE TABLE table_39906 (
    "Number" real,
    "Builder" text,
    "Type" text,
    "Date" text,
    "Works number" text
) ### Response: SELECT "Works number" FROM table_39906 WHERE "Builder" = 'avonside engine company' AND "Type" = '4-6-0' AND "Number" < '12' AND "Date" = 'december 1871'