Like a half moon, there is no sign.
Or the door, then there is no '+', why?
This is a door, and the door is a semi-circular.
A lot of elements of a door, only a shape can not judge.
There is the door, there is> = 1 is the door, there is a non-door. These can only judge a single door, if it is a combination of doors can not be used. To determine exactly what the door is, you have to give detailed information.
