What is High Rebounds, when Location Attendance is 'Madison Square Garden Unknown', and when Date is 'May 18'?
CREATE TABLE table_49210 (
    "Game" real,
    "Date" text,
    "Team" text,
    "Score" text,
    "High points" text,
    "High rebounds" text,
    "High assists" text,
    "Location Attendance" text,
    "Series" text
)
SELECT "High rebounds" FROM table_49210 WHERE "Location Attendance" = 'madison square garden unknown' AND "Date" = 'may 18'
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 High Rebounds, when Location Attendance is 'Madison Square Garden Unknown', and when Date is 'May 18'? ### Input: CREATE TABLE table_49210 (
    "Game" real,
    "Date" text,
    "Team" text,
    "Score" text,
    "High points" text,
    "High rebounds" text,
    "High assists" text,
    "Location Attendance" text,
    "Series" text
) ### Response: SELECT "High rebounds" FROM table_49210 WHERE "Location Attendance" = 'madison square garden unknown' AND "Date" = 'may 18'