"cat and dog must appear exactly once."
That violates
K(dog)() K(K)()(dog)() K(K(K)()(dog))(K)()
K(dog)()
K(K)()(dog)()
K(K(K)()(dog))(K)()
I added that rule in afterwards. These solutions were valid at the time he posted, so I'll give him credit for the creativity :)
I was the first to solve his problem :D He changed the rules after I posted my solution. Check the comments.
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That violates
K(dog)()K(K)()(dog)()K(K(K)()(dog))(K)()I added that rule in afterwards. These solutions were valid at the time he posted, so I'll give him credit for the creativity :)
I was the first to solve his problem :D
He changed the rules after I posted my solution.
Check the comments.