Suppose we have a uniform rectanglular grid as shown below. The `a` is an agent, `o` is obstacle and `g` is goal. What are the options of handling multitile agents (e.g. dragons or tanks)?


 . . . . o . . .
 . . . . o . g .
 . a a . . . . . <-- too tight
 . a a . o . . .
 . . . . o . . .
 . . . . . . . . <-- should go through this gate
 . . . . . . . .
 . . . . o . . .