%29%29" class="RktValLink" data-pltdoc="x">or/c</a></span><span class="hspace">&nbsp;</span><span class="RktPn">(</span><span class="RktSym"><a href="http://docs.racket-lang.org/reference/Object_and_Class_Contracts.html#%28def._%28%28lib._racket%2Fclass..rkt%29._is-a~3f%2Fc%29%29" class="RktValLink" data-pltdoc="x">is-a?/c</a></span><span class="hspace">&nbsp;</span><span class="RktSym"><a href="pad_.html" class="RktValLink" data-pltdoc="x">pad%</a></span><span class="RktPn">)</span><span class="hspace">&nb