what is the combined weight of the big boy and the m1 ?
CREATE TABLE table_204_850 (
    id number,
    "name" text,
    "railway" text,
    "series" text,
    "maker" text,
    "dates" text,
    "drive" text,
    "wheel arrangement" text,
    "weight" text,
    "power" text,
    "notes" text
)
SELECT SUM("weight") FROM table_204_850 WHERE "name" IN ('big boy', 'm1')
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 combined weight of the big boy and the m1 ? ### Input: CREATE TABLE table_204_850 (
    id number,
    "name" text,
    "railway" text,
    "series" text,
    "maker" text,
    "dates" text,
    "drive" text,
    "wheel arrangement" text,
    "weight" text,
    "power" text,
    "notes" text
) ### Response: SELECT SUM("weight") FROM table_204_850 WHERE "name" IN ('big boy', 'm1')