Square-free Words with Square-free Self-shuffles
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Currie, James D.
Currie, James D., and Kalle Saari. "Square-free Words with Square-free Self-shuffles." Electronic Journal of Combinatorics 21(1) (2014): Paper #P1.9.
We answer a question of Harju: For every n ≥ 3 there is a square-free ternary word of length n with a square-free self-shuffle.