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In the interest of studying formulas with reversal of high avoidabilityindex, we find $n$-avoidance bases for formulas with reversal for$n\in\{1,2,3\}$. We demonstrate that there is a unique formula with reversal ineach of these three bases of highest avoidability index $n+2$; these formulasare $xx$, $xyx\cdot y^R$, and $xyzx\cdot y^R\cdot z^R$, which belong to aninfinite family of formulas with reversal that has been the subject of recentstudy by the authors.

Avoidance bases for formulas with reversal