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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E68">Th67</font></span>: <a NAME="T67"><span class="comment"><font color="firebrick">:: SHEFFER2:67</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">L</font> being   non  <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a>   <a href="sheffer1.html#L1" title="SHEFFER1:struct.1">ShefferStr</a>   st <font color="Olive" title="b1">L</font> is  <a href="sheffer2.html#V1" title="SHEFFER2:attr.1">satisfying_Sh_1</a>  holds <br/><font color="Olive" title="b1">L</font> is  <a href="sheffer1.html#V10" title="SHEFFER1:attr.10">satisfying_Sheffer_1</a> </div></div>
