On avoidability of formulas with reversal
While a characterization of unavoidable formulas (without reversal) is well-known, little is known about the avoidability of formulas with reversal in general. In this article, we characterize the unavoidable formulas with reversal that have at most two one-way variables ($x$ is a one-way variable in formula with reversal $ϕ$ if exactly one of $x$ and $x^R$ appears in $ϕ$).
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