adding equative type sentences 

@ruiting @AmeBel @linas  please have a look on binary relationships.
I don't understand why it should be _as(long, Ben)? So first, the head of comparison entity is "hair" instead of "Ben". Second, if we want to keep all the comparatives representations consistent, we should use: 
```
_compare(long, hair) 
as(Amen, Ben)
```