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# Paterson's worms - Erase solid regions, leaving only points with at least
# one uneaten edge, and the single point or line with an arrow. Use this
# with rules like 1252121 and 1525115, which fill regions with density
# near 100%, to see the uneaten paths within the regions: After running
# such a rule for a while, switch to this rule and run for 1 generation.
# (by Dean Hickerson, 11/20/2008)
# 0 empty (unvisited point or line)
# 1-6 'point with arrow', showing direction of next movement
# (1=E; 2=SE; 3=SW; 4=W; 5=NW; 6=NE)
# 7 point that's been visited
# 8,9,10 edge - (8=line; 9=E arrow; 10=W arrow)
# 11,12,13 edge / (11=line; 12=NE arrow; 13=SW arrow)
# 14,15,16 edge \ (14=line; 15=SE arrow; 16=NW arrow)
n_states:17
neighborhood:Moore
symmetries:none
var a0={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
var a1={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
var a2={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
var a3={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
var a4={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
var a5={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
var a6={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
var a7={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
var line={8,11,14}
# visited point dies if it has 6 lines out from it
7,11,a0,8,a1,14,11,8,14,0
# undirected lines die
line,a0,a1,a2,a3,a4,a5,a6,a7,0
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