diff --git a/main.py b/main.py
index 795c0b0..1e20e80 100644
--- a/main.py
+++ b/main.py
@@ -1,4 +1,9 @@
-#/usr/bin/env python3
+#!/usr/bin/env python3
+from enum import Enum
+class SquareType(Enum):
+    AISLE = 0
+    SEAT = 1
+
 
 height=7
 width=33
@@ -7,9 +12,11 @@ class GridSquare:
     def __init__(self, typ, occupant):
         self.typ = typ
         self.occupant = occupant
+    def __str__(self):
+        return "(%s|%s)" % (str(typ), str(occupant))
 
 def makeGrid():
-    return [[GridSquare(0, 0) for x in range(0,height)] for y in range(0,width)]
+    return [[GridSquare(SquareType.AISLE, 0) for x in range(0,width)] for y in range(0,height)]
 
 class Passenger:
     #dest and curr are both 2-tuples
@@ -17,6 +24,16 @@ class Passenger:
         self.dest = dest
         self.curr = curr
 
+def manhattanDistance(pos1, pos2):
+    return abs(pos1[0] - pos2[0]) + abs(pos1[1] - pos2[1])
+
+def mooreNeighbourhood(pos):
+    
+
+def nextSquare(passenger, grid):
+    #simple behaviour for now
+    for i in 
+
 def GenPassList():
     return []
 
@@ -24,4 +41,8 @@ grid=makeGrid()
 
 passengers = GenPassList()
 
-print(grid)
+def tick():
+    # print grid
+    print(grid)
+    
+