col1	col2	col3	file_idx	join_idx
A	A	line1	0	1
A	A	line1	1	1
B	A	line2	0	2
C	A	line3	0	3
D	A	line4	0	4
E	A	line5	0	5
E	A	line5	1	5
F	A	line6	0	6
G	A	line7	0	7
H	A	line8	0	8
I	A	line9	0	9
I	A	line9	1	9
J	A	line10	0	10
K	A	line11	0	11
L	A	line12	0	12
M	A	line13	0	13
M	A	line13	1	13
N	A	line14	0	14
O	A	line15	0	15
P	A	line16	0	16
Q	A	line17	0	17
Q	A	line17	1	17
R	A	line18	0	18
S	A	line19	0	19
T	A	line20	0	20
U	A	line21	0	21
U	A	line21	1	21
W	A	line23	0	22
Y	A	line25	0	23
Y	A	line25	1	23
Z	A	line22	0	24
Z	A	line24	0	24
Z	A	line26	0	24
Z	A	line26	1	24
