ss='op'>)</span>

<span class='fu'>hide_reg</span><span class='op'>(</span><span class='va'>data</span>, <span class='va'>...</span><span class='op'>)</span>

<span class='fu'>show_reg</span><span class='op'>(</span><span class='va'>data</span>, <span class='va'>...</span><span class='op'>)</span>

<span class='fu'>colour_reg</span><span class='op'>(</span><span class='va'>data</span>, colour <span class='op'>=</span> <span class='st'>"black"</span>, <span class='va'>...</span><span class='op'>)</span>

<sp