output 5*5 test
+---+---+---+---+---+
| | |
+ +---+ + + +
| | | |
+ + +---+---+ +
| | | | |
+ +---+---+ + +
| | | |
+ + + +---+ +
| | | |
+---+---+---+---+---+
+---+---+---+---+---+
| | |
+ + +---+---+ +
| | |
+---+---+ +---+ +
| | | |
+ +---+---+ + +
| | | | |
+ + + + + +
| | | |
+---+---+---+---+---+
+---+---+---+---+---+
| | |
+---+ + + +---+
| | | |
+---+---+ +---+ +
| | | |
+ +---+---+ + +
| | |
+ +---+---+---+ +
| |
+---+---+---+---+---+