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<b>let </b><font color="Maroon">H</font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/>

<b>assume </b><a NAME="E1:30"/>
( not <font color="Maroon">H</font> <a href="zf_lang.html#NR1" target="_self">is_equality</a>  &amp; not <font color="Maroon">H</font> <a href="zf_lang.html#NR2" target="_self">is_membership</a>  )
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="zf_lang.html#D15" target="_self">ZF_LANG:def 15</a><br/>

<b>hence </b><a NAME="E2:30"/>
( <font color="Maroon">H</font> is <a href="zf_lang.html#V4" target="_self">negative</a> or <font color="Maroon">H</font> is <a href="zf_lang.html#V5" target="_self">conjunctive</a> or <font color="Maroon">H</font> is <a href="zf_lang.html#V6" target="_self">universal</a> )
 <b>by </b><i/>;<br/>


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