'color:#bf0303;'>(</span>qf <span style='color:#b08000;'>5</span><span style='color:#bf0303;'>)</span> == <b><span style='color:#bf0303;'>'</span></b><span style='color:#bf0303;'>(</span>factorial <span style='color:#b08000;'>5</span><span style='color:#bf0303;'>)</span>); <i><span style='color:#898887;'>// prints: true</span></i>
print &lt;&lt; reduce <b><span style='color:#000000;'>$.</span></b> <b><span style='color:#bf0303;'>'</span></b><span style='color:#bf0303;'>(</span>factorial <span style='color:#