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@::=::: S::=N E::=N W::=N aN,::=b aNN,::=a bN,::=a a.,::=~1 b.,::=~1 bNN::=~0 ::= a@,.,
Takes comma-separated input
@::=::: S::=N E::=N W::=N aN,::=b aNN,::=a bN,::=a a.::=~1 b.::=~1 bNN::=~0 ::= a@,.
@::=::: S::=N E::=N W::=N aN,::=b aNN,::=a bN,::=a a,::=~1 b,::=~1 bNN::=~0 ::= a@,,
@::=::: N::=X S::=X=N E::=X=N W::=X=N aXaN,::=b aXXaNN,::=a bXbN,::=a aX.::=~1 bXa.::=~1 ab.::=~1 bXX,bNN::=~0 ::= a@,.
@::=::: N::=X S::=X E::=X W::=X aX,::=b aXX,::=a bX,::=a aX.::=~1 bX.::=~1 a.::=~1 bXX,::=~0 ::= a@.
