# 0 x*** -> N 0   # if there's nothing to the N, go N
# 0 N*** -> X 1   # if N is blocked, switch to state 1

# W=o N=1 E=2 S=3

# --Left(West)Go-if's--------------------------
0 xxxx -> W 0
0 Nxxx -> W 0
0 xExx -> W 0
0 xxxS -> W 0
0 NExx -> W 0
0 NxxS -> W 0
0 xExS -> W 0
0 NExS -> W 0
# --Left(West)Blocks/switches-------------------
0 xxWx -> X 3 #s
0 NxWx -> X 3 #s
0 xxWS -> X 1 #N
0 NEWx -> X 3 #s
0 xEWx -> X 1 #N
0 NxWS -> X 2 #E
0 xEWS -> X 1 #N

# --Straight(North)Go-if's-----------------------
1 xExx -> N 1
1 xxWx -> N 1
1 xxxS -> N 1
1 xEWx -> N 1
1 xExS -> N 1
1 xxWS -> N 1
1 xEWS -> N 1

# --Straight(North)Blocks/Switches----------------
1 xxxx -> X 0 #w
1 Nxxx -> X 0 #w
1 NExx -> X 0 #w
1 NxWx -> X 2 #E
1 NxxS -> X 0 #W
1 NEWx -> X 3 #s
1 NExS -> X 0 #W
1 NxWS -> X 2 #e

#--Right(East)Go-if's------------------------------
2 Nxxx -> X 3 #2
2 xxWx -> E 2
2 xxxS -> E 0 #2
2 NxWx -> E 2
2 NxxS -> E 2
2 xxWS -> E 2
2 NxWS -> E 2

#--Right(East)Blocks/Switches-----------------------
2 xxxx -> X 1 #0? S
2 xExx -> X 3 #s
2 NExx -> X 3 #s
2 xEWx -> X 2 #W ?
2 xExS -> X 1 #N
2 NEWx -> X 3 #s
2 NExS -> X 0 #w
2 xEWS -> X 1 #n

#--Down(South)Go-if's-------------------------------
3 Nxxx -> S 3
3 xExx -> S 3
3 xxWx -> S 3
3 NExx -> S 3
3 NxWx -> S 3
3 xEWx -> S 3
3 NEWx -> S 3

#--Down(South)Blocks/Switches-------------------------
#3 Nxxx -> X 3
3 xxxx -> X 3 #e
3 xxxS -> X 0 #e
3 NxxS -> X 0 #w
3 xExS -> X 0 #w
3 xxWS -> X 2 #e
3 NExS -> X 0 #w
3 NxWS -> X 2 #e
3 xEWS -> X 1 #n