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<b>let </b><font color="Maroon">D</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">f</font> be    <a href="finseq_1.html#M2">FinSequence</a> of <font color="Maroon">D</font>;<br/><b>let </b><font color="Maroon">G</font> be   <a href="matrix_1.html#NM1">Matrix</a> of <font color="Maroon">D</font>;<br/><b>let </b><font color="Maroon">p</font> be    <a href="hidden.html#M1">set</a> ;<br/>







<b>assume </b><a NAME="E1:4"/>
<font color="Maroon">f</font> <a href="goboard1.html#R1">is_sequence_on</a> <font color="Maroon">G</font>
 ;<br/>

<a NAME="E2:4"/><b>then </b>
<font color="Maroon">f</font> <a href="finseq_1.html#K17">|</a> <span class="p1">(<span class="default"><font color="Maroon">p</font> <a href="finseq_4.html#K5">..</a> <font color="Maroon">f</font></span>)</span> <a href="goboard1.html#R1">is_sequence_on</a> <font color="Maroon">G</font>
 
<b>by </b><i><a class="ref" href="goboard1.html#T38">GOBOARD1:38</a></i>;<br/>
<b>hence </b><a NAME="E3:4"/>
<font color="Maroon">f</font> <a href="finseq_5.html#K1">-:</a> <font color="Maroon">p</font> <a href="goboard1.html#R1">is_sequence_on</a> <font color="Maroon">G</font>
 <b>by </b><i><a class="ref" href="finseq_5.html#D1">FINSEQ_5:def 1</a></i>;<br/>


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