const n=10.
const m=10.
const r=18.

room(0,1,1,2,2).  has(0,0).
room(1,1,3,2,5).  has(1,1).
room(2,6,1,8,2).  has(2,1).
room(3,3,4,5,5).  has(3,2).
room(4,3,1,5,2).  has(4,-1). 
room(5,3,3,5,3).  has(5,-1).
room(6,6,3,8,5).  has(6,2).
room(7,3,6,5,8).  has(7,5).
room(8,6,6,8,7).  has(8,0).
room(9,1,6,2,8).  has(9,-1).
room(10,6,8,8,8). has(10,-1).
room(11,9,6,10,8). has(11,1).
room(12,9,1,10,2). has(12,-1).
room(13,9,3,10,5). has(13,-1).
room(14,9,9,10,10). has(14,0).
room(15,1,9,2,10). has(15,-1).
room(16,3,9,5,10). has(16,-1).
room(17,6,9,8,10). has(17,-1).
