. . \begin{array}{c}O \\ [2mm] O \\ [1mm] O \\ O \\ [-1mm] O \\ [-2mm] O \\ [-3mm] O \\[-5mm]\end{array}


. . O\;\:O\;O\:O\,O O\! O\!\! O


. . \frac{1{\color{red}\rlap{/}}6}{{\color{red}\rlap{/}}64} \;=\;\frac{1}{4}