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<b>take </b>
 <a href="struct_0.html#G1" title="STRUCT_0:aggr.1">1-sorted</a>(# <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  #)
;<br/>

<b>thus </b><a NAME="E1:4_1_1"/>
 <a href="struct_0.html#G1" title="STRUCT_0:aggr.1">1-sorted</a>(# <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  #) is <a href="struct_0.html#V3" title="STRUCT_0:attr.3">empty</a>
 <b>by </b><i><a class="ref" href="struct_0.html#D1" title="STRUCT_0:def.1">STRUCT_0:def 1</a></i>;<br/>


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