 </span><span class="op">{</span><span class="nam">r</span><span class="op">}</span><span class="fst"> </span><span class="op">{</span><span class="nam">r</span><span class="op">}</span><span class="fst"> 0 0 1 </span><span class="op">{</span><span class="nam">x0</span> <span class="op">+</span> <span class="nam">r</span><span class="op">}</span><span class="fst">,</span><span class="op">{</span><span class="nam">y0</span><span class="op">}</span><span class="fst">"</span><span class="op">)</span>&nbsp;</sp