d3b 表示间接出口，d3c表示直接出口，d12b表示进口，我要求既有进口又有出口的并集，应该用哪个命令呢？

d3b	d3c	d12b
0	0	0
Don't know	Don't know	Don't know
0	30	Don't know
25	5	20
0	0	0
0	30	0
0	0	0
40	0	0
0	0	0
0	30	0
0	100	0
0	0	0
0	0	0
0	0	0
0	0	0
0	0	0
0	0	20
0	0	0
0	0	0
0	0	0
10	0	0
0	0	0
0	0	0
0	0	0