Complete the pattern: s, e, i, d, n, a until you can't go any further.

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S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,S, E, I, D, N, A,

All of the above
a
b
c
d