key1
key2
key3
key4
val1
val2
val3
val4
A
F
T
L
1
0
0
0
B
F
R
C
1
1
0
1
C
1
1
0
1
C
1
1
0
1
C
F
R
B
1
1
1
0
C
1
1
1
0
P
R
B
1
1
1
0