1000 1000
OPEN 0 0 10 10
OPEN 0 999 10 10
OPEN 0 991 10 10
OPEN 0 990 10 10
OPEN 999 0 10 10
OPEN 991 0 10 10
OPEN 990 0 10 10
OPEN 999 999 10 10
OPEN 991 991 10 10
OPEN 990 990 10 10
OPEN 990 500 20 20
OPEN 500 990 20 20
OPEN 10 10 980 980
