title 
Parity-Infinity

description
Halts if input contains an odd number of a's.  Goes into an infinite loop for an even number of a's

vertices
0 R 0.25 0.2
1 R 0.75 0.2
2 L 0.25 0.8
3 L 0.75 0.8
4 H 0.75 0.5

edges
0 1 a b 0.2
0 2 # # 0.3
1 0 a b 0.2
1 4 # #
2 0 # # 0.3
2 3 b a 0.2
3 2 b a 0.2

tapes
[a] a a a a
[a]
[a] a a a a a a a
[a] a a a a a a a a a