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(N (E (B, E, A, N), A (B, E, A, N)), A (E (A, B, E, N), A (B, B, A, B)), B…
N
E
B
E
A
N
A
B
E
A
N
A
E
A
B
E
N
A
B
B
A
B
B
E
B
E
A
N
A
B
E
A
N
E
E
B
E
A
N
A
B
E
A
N