The schema is like below:

```
{
set {
_:x1 <gid> "test1" .
_:x2 <gid> "test2" .
_:x3 <gid> "test3" .
_:x4 <gid> "test4" .
_:x5 <gid> "test5" .
_:y1 <userid> "u1" .
_:y2 <userid> "u2" .
_:y3 <userid> "u3" .
_:y4 <userid> "u4" .
_:y5 <userid> "u5" .
_:y6 <userid> "u6" .
_:y7 <userid> "u7" .
_:y8 <userid> "u8" .
_:y9 <userid> "u9" .
_:x1 <impress> _:y1 .
_:x1 <impress> _:y2 .
_:x1 <impress> _:y3 .
_:x1 <impress> _:y4 .
_:x1 <impress> _:y5 .
_:x2 <impress> _:y1 .
_:x2 <impress> _:y2 .
_:x2 <impress> _:y3 .
_:x2 <impress> _:y8 .
_:x3 <impress> _:y1 .
_:x3 <impress> _:y2 .
_:x3 <impress> _:y8 .
_:x4 <impress> _:y6 .
_:x4 <impress> _:y7 .
_:x5 <impress> _:y6 .
_:x5 <impress> _:y7 .
}
}
```

Given `overlap rate = intersection/union`

So, how can I use query to calculate overlap rate of each two nodes(from x1 to x5).

For example

x1 connect to [y1,y2,y3,y4,y5]

x2 connect to [y1,y2,y3,y8]

x1 and x2 union is [y1,y2,y3,y4,y5,y8]

x1 and x2 intersection is [y1,y2,y3]

So the rate is 3/6.

The question is how can I write a loop query to calculate rate bewteen each two nodes?

like

[x1,x2] : 3/6

[x1,x3]: 2/6

[x1,x4]: 0/7

…

[x4,x5]: 2/2