[[book, [at, [book, [of, [[lean], cow, [of, [[mean], book]]]]]]], [saw], [[mean, lean, mean], Alice]]
[[[lean, lean], Alice], [found], [[lean], book, [at, [[lean, lean, lean], book]]]]
[[[lean, mean, green, green, lean], Alice], [saw, carefully], [book, [at, [[mean], cow]]]]
Input has invalid tokens.
[[cow, [with, [book]]], [found], [[mean], book]]
[[cow, [at, [[mean], cow]]], [lifted], [Alice, [at, [book, [with, [Alice]]]]]]
[[cow, [with, [book, [at, [cow]]]]], [saw, carefully], [[lean], cow]]
Input is not a sentence.