> Consider the definition of <span 
class="pcrr7t-">tup</span>.
     <ul class="itemize1">
     <li class="itemize">The references to <span 
class="pcrr7t-">b</span> and <span 
class="pcrr7t-">c</span> can be unambiguously resolved to <span 
class="pcrr7t-">b</span> declared in <span 
class="pcrr7t-">B</span>, and <span 
class="pcrr7t-">c</span> declared in <span 
class="pcrr7t-">C</span>
     respectively.
     </li>
     <li class="itemize">The reference to <span 
class="pcrr7t-">d</span> is unambiguously